Who We Are

The ISA Board of Directors is an elected board of 15 Directors, including ten (10) Director positions voted in by a general election; three (3) Director positions filled by an election from within the Council of Representatives; and a President/Chair of the Board and a President/Chair-Elect elected by the Board of Directors from within the current Directors.

Email the ISA Board of Directors

Purpose

The Board of Directors will be responsible for strategic direction for the organization and make decisions that are in the best interest of the organization including fiscal oversight and policy development.

Past Presidents

2022–2023 Board of Directors

Chris Walsh
Chris Walsh
President
Term Expires August 2023
Christchurch, New Zealand
Managing Director, Treetech Specialist Treecare, Ltd.
Chris Walsh
Chris Walsh
President
Term Expires August 2023
Christchurch, New Zealand
Managing Director, Treetech Specialist Treecare, Ltd.

Chris Walsh is the Founder and Managing Director of Treetech Specialist Treecare Ltd in New Zealand, a multi-faceted urban forest management company employing over 100 team members in Christchurch and Wellington.

Sectors that Chris works in are wide-ranging from residential, council, utilities, consultancy and commercial sectors. Chris is a results-oriented business professional with proven abilities in governance, strategic planning and contract management; ensuring systems of both Treetech and the boards on which he sits are delivered to a high quality and are cost efficient.

Chris holds a Certificate in Arboriculture (Merrist Wood, UK), National Certificate in Arboriculture, Trade Certificate in Horticulture and Amenity Turf Management, and a National Certificate in Horticulture. He holds an ISA Tree Risk Assessment Qualification gained in New Zealand and is a licenced Quantified Tree Risk Assessment (QTRA) practitioner. He has worked in the arboricultural and horticultural industries for 27 years.

Chris has served on the New Zealand Arboricultural Association Executive Committee, the ISA New Zealand Chapter since 2009, and was the 2014-15 president. He is a life member with NZ ARB. In his role with ISA, he has attended multiple ISA Leadership Workshops at ISA Headquarters. Chris has served on the ISA Board since 2016 and has held roles as Treasurer, COR Liaison and Vice President.

Nicolaas Verloop
Nicolaas Verloop
President-Elect
Term expires August 2024
Harmelen, The Netherlands
Commercial Director, TFI Vital Green
Nicolaas Verloop
Nicolaas Verloop
President-Elect
Term expires August 2024
Harmelen, The Netherlands
Commercial Director, TFI Vital Green

Nicolaas Verloop has worked in arboriculture for the last 35 years. After school, he worked for three years in England, France, and the United States, after which he started his own landscape gardening company. After selling his company, he served as the director for several leading green industry companies. During that time, Nicolaas and three associates founded GreenGuard, a company which develops and produces biological products especially for landscapers, tree care companies, and councils. Currently, Nicolaas is working as a partner of TFI Vital Green, a specialized company that is creating optimal tree-growth opportunities for trees in the urban environment.

Nicolaas has a great interest in business strategies, marketing, and education for our profession. For the last eight years he has served on the KPB-ISA Dutch Chapter Board and has served the Dutch Employers’ Association for the last ten years as a board member of the tree department. Both associations wish to stimulate the arboriculture profession and opportunities for good education.

Nicolaas has served ISA as a chapter executive and as a member of the Student Subcommittee and the Memorandum of Understanding (MoU) Committee. He was a member of the ISA Council of Representatives (CoR) for three years before being named the CoR Chair from 2014 to 2016.

John Gathright
John Gathright
Vice President
Term Expires August 2024
Seto, Aichi Japan
Director, Japan Arborist Training Institute
John Gathright
John Gathright
Vice President
Term Expires August 2024
Seto, Aichi Japan
Director, Japan Arborist Training Institute

John Gathright is a permanent resident of Japan. He holds a Doctorate of Bio-Agriculture from Nagoya University and lectures at Chubu University. He has conducted extensive research into the physiological, psychological and societal benefits of purpose specific, tree-climbing and tree-assisted therapy programs. He is a pioneer and leader in this field. 

John founded Tree Climbing Japan in 1997. This was Japan’s first technical tree-climbing school. It has grown into a national organization with 4,000 certified tree climbers who have helped over 250,000 individuals of all ages and abilities, to climb trees in urban forests and green spaces.

Dr. Gathright created the Japan Arborist Association, an ISA affiliated organization and the Arborist Training Institute of Japan.

In 2000, John established Tree Hab, a non-profit organization that works with societies, government, doctors and child care facilities in order to enable mentally and physically handicapped children to also experience the joy of climbing a tree.

When not climbing trees, training tree-climbing instructors or enjoying the smiles of the children and families he helps, he can be seen sharing his expertise at events and conferences around the world.

Gail Nozal
Gail Nozal
Secretary
Term Expires August 2024
South Saint Paul, MN
Area Manager, Davey Resource Group
Gail Nozal
Gail Nozal
Secretary
Term Expires August 2024
South Saint Paul, MN
Area Manager, Davey Resource Group

Gail Nozal has over 25 years of experience in the municipal, non-profit and commercial sectors of urban forestry and arboriculture. She is an ISA Board Certified Master Arborist, Municipal Specialist and holds the Tree Risk Assessment Qualification (TRAQ).She is an Area Manager with the Davey Resource Group.

She is a member of the Minnesota Chapter of the ISA. Gail earned her master's degree in Urban Forestry at the University of Minnesota. Her years of service have included Chair of the Certification Committee in the Minnesota ISA Chapter, ISA Certification Liaison Committee, ISA Credential Council and is currently serving her second term on the ISA Board. In addition she has also been involved with the Minnesota Shade Tree Advisory Committee which serves as the state urban forestry council in Minnesota. While involved in MnSTAC she served on several committees including serving as a Board Member and Chair of the Outreach Committee. 

Gail is passionate about teaching youth, volunteers and professionals about opportunities in arboriculture.She believes serving on the board is an opportunity to continue to expand and share her passion by encouraging others to get involved in the field of arboriculture.

Sharon Jean-Philippe
Sharon Jean-Philippe
Treasurer
Term Expires August 2023
Tennessee, USA
Associate Professor of Urban Forestry, University of Tennessee
Sharon Jean-Philippe
Sharon Jean-Philippe
Treasurer
Term Expires August 2023
Tennessee, USA
Associate Professor of Urban Forestry, University of Tennessee

Sharon Jean-Philippe is an Associate Professor of Urban Forestry in the
Department of Forestry, Wildlife and Fisheries (FWF). She earned her
M.S. in Botany and PhD. in Natural Resources from the University of
Tennessee in 2005 and 2010, respectively.

Sharon has successfully led the development and approval of FWF's
Forestry curriculum concentration in "Urban Forestry" (the
concentration became official beginning in the fall of 2012). Her teaching-related duties for this concentration have gradually shifted from curriculum development to instruction and recruiting, where she teaches courses in the fields of urban forestry, tree law, urban soils and arboriculture.

Sharon applies her substantial teaching skills to promote outreach program to the citizens of Tennessee. Her Extension appointment allows her to work with Extension agents and specialists, as well as directly with all Tennesseans, to help them with their urban forest needs.

Sharon is married to Smith Jean-Philippe and they have two sons, Sidney and Seth Jean-Philippe and they enjoy cruising.

Tom Smiley, Ph.D
Tom Smiley, Ph.D
Term Expires August 2025
Charlotte, North Carolina USA
Senior Arboriculture Researcher, Bartlett Tree Research Laboratories, Adjunct Professor, Clemson University
Tom Smiley, Ph.D
Tom Smiley, Ph.D
Term Expires August 2025
Charlotte, North Carolina USA
Senior Arboriculture Researcher, Bartlett Tree Research Laboratories, Adjunct Professor, Clemson University

Tom has served as President of the Southern Chapter, founding chair of the Board Certified Master Arborist committee, Tree Risk Assessment Qualification panel of experts, Tree Care Industry Association's member on the Council of Tree and Landscape Appraisers, International Tree Failure Database steering committee, Singapore National Parks Board-Research Advisor, and the American Society of Consulting Arborist's (ASCA) Tree and Plant Appraisal Qualification committee. 

He is the long time chair of the ISA Best Management Practice (BMP) committee and has co-authored many of the BMP' s. He is one of the longest serving advisors to the American National Standards 
Institute A300 committee. 

He has received many awards including Shigo Education, Chadwick Research, Author's Citation, President's Commendation, Southern Chapter Award of Merit, Society of Municipal Arborists Award of Achievement, Society of Commercial Arborists Arborist of the Year, Urban Tree Diagnosis Association of Japan -Honorary Member. 

Tom graduated from the University of Wisconsin-Madison, Colorado State University, and Michigan State University. He is an ASCA Registered Consulting Arborist. 

Caitlyn Pollihan
Caitlyn Pollihan
CEO and Executive Director
Ex-Officio, Non-Voting
Atlanta, Georgia, USA
International Society of Arboriculture
Caitlyn Pollihan
Caitlyn Pollihan
CEO and Executive Director
Ex-Officio, Non-Voting
Atlanta, Georgia, USA
International Society of Arboriculture

Caitlyn Pollihan serves as CEO and Executive Director for the International Society of Arboriculture (ISA).  She began her role as Executive Director in 2017, with the Board adding the CEO title in 2020 to better reflect Caitlyn’s leadership responsibilities. During her tenure Caitlyn has successfully led the organization’s relocation to Atlanta, GA US, initiated the modernization of ISA systems and operations, and has increased the global connectivity and accessibility of the association.

Prior to joining ISA, Caitlyn served as the executive director of the Council of Western State Foresters (CWSF) and the Western Forestry Leadership Coalition (WFLC). In this role, she facilitated the development of the organization’s strategic goals and agendas and worked with members and CWSF/WFLC staff to ensure the organization’s success. Prior to this role, Caitlyn was the CWSF/WFLC governmental affairs director where she was instrumental in the creation of key legislation and educating members and partners on legislative proposals and national policy with western implications.

Caitlyn previously served as the staff vice president for government and environment affairs for the Home Builders Association of St. Louis and Eastern Missouri. In this role, she worked on state and local legislative initiatives, green building programs, and helped create and implement a ground‐breaking approach to building site safety inspections with the Occupational Safety and Health Administration. 

Caitlyn participates in several coalitions and committees, such as the Sustainable Urban Forestry Coalition Steering Committee, the i-Tree Executive Committee, and previously served on numerous public policy committees and was an appointed member of the National Advisory Committee for Implementation of the National Forest System Land Management Planning Rule.

Caitlyn holds a bachelor’s degree in contemporary media and journalism/public relations from the University of South Dakota and a master’s degree in organizational communication from the University of Missouri‐St. Louis. She has a Certificate in Nonprofit Organization Management from the US Chamber of Commerce Foundation’s Institute for Organization Management and has earned the Certified Association Executive (CAE) credential, the highest professional credential in the association industry.

Russ Carlson
Russ Carlson
Term Expires August 2023
Bear, Delaware, USA
Senior Consultant, Tree Tech Consulting
Russ Carlson
Russ Carlson
Term Expires August 2023
Bear, Delaware, USA
Senior Consultant, Tree Tech Consulting

Russ Carlson has worked in the field of arboriculture since 1977 as a commercial arborist and an independent consulting arborist. Throughout his career, Russ has taken a multidisciplinary approach to arboriculture with a broad knowledge of trees, the environment, and the associations of trees and people.

Since 1983, Russ has been an ISA Certified Arborist® with the ISA Pennsylvania-Delaware Chapter, and with ISA when the program became international in 1993. In 2004, he earned the ISA Board Certified Master Arborist® credential. He has been a member and Registered Consulting Arborist of the American Society of Consulting Arborists since 1994. In 2010, he became a Certified Tree Risk Assessor and achieved the ISA Tree Risk Assessment Qualification when the program was initiated.

Russ has presented workshops, seminars, and lectures at various venues and served as an instructor at the American Society of Consulting Arborists (ASCA) Consulting Academy from 1997 through 2010, developing and teaching the Report Writing and the Forensic Investigations training modules.

He has been active in the arboriculture industry, serving on ISA, Penn-Del Chapter, and ASCA committees and boards, including strategic planning committees and the governance committee. Russ also represented ISA on the Council of Tree and Landscape Appraisers for eight years.

Russ has been an active volunteer at the Tri-State Bird Rescue Clinic for 13 years. He enjoys birding, hiking, photography, and travel.

Christopher Boza
Christopher Boza
Term Expires August 2025
Chattaroy, Washington, USA
City of Missoula, MT, City Forester, Retired, City of Chico, CA, Urban Forester, Retired, City of San Jose, CA, Assistant Arborist, Retired
Christopher Boza
Christopher Boza
Term Expires August 2025
Chattaroy, Washington, USA
City of Missoula, MT, City Forester, Retired, City of Chico, CA, Urban Forester, Retired, City of San Jose, CA, Assistant Arborist, Retired

Christopher Boza is currently a consultant with over 40 years of experience in municipal tree management, park management, employee management, fiscal budget management, irrigation design, construction and management, landscape design, construction and maintenance management, capital project construction management, volunteer coordination and inter-agency coordination.

Chris tested for and received his Arborist Certification in 1986. He holds a Municipal

Arborist Specialist certification and a Tree Risk Assessor Qualification. He served on the Western Chapter Certification Committee from 1992 to 2000. He served on the Montana Urban and Community Forestry Association (MUCFA) board from 2014 to 2016.

Chris recently retired from the City Arborist for the City of Missoula, Montana. Prior to Missoula, Chris served as the Urban Forester for Hayden, Idaho, the Urban Forester for Chico, California, the Assistant Arborist for San Jose, California, and as a Field Tech for Forest-Ag in Lafayette, California. His first experience in municipal tree care occurred during the Summer of 1980, collecting data for a street tree inventory in Sterling Heights, Michigan, on paper forms!

Chris is passionate about educating residents and homeowners about proper tree and landscape care. He has facilitated numerous public and industry seminars in San Jose, Chico, Hayden and Missoula. He was instrumental in the formation of the Chico Tree Education and Enhancement (CTrEE) volunteer program in Chico, the Community Canopy volunteer program in Hayden and the Volunteers in Planting/ Pruning (VIP) volunteer program in Missoula.  His favorite project was an introductory urban forestry class for high school students at Big Sky High School in Missoula.

In his spare time, Chris is an avid model railroader in in 1:1 and 1:87 scales. He models the Grand Trunk Western Railroad in Detroit, Michigan.  He is a member of the Pacific Locomotive Association and the Inland Empire Railroad Historical Society. He served as the Chief Arborist for the Niles Canyon Railway from 1988 to 2006. He held a Lone Railway Worker Certificate and a Conductor Certificate from 1990 to 2008.

Samuel Ma
Samuel Ma
Term Expires August 2023
Hong Kong
Director, Consulting Arborist & Climbing Specialist Kassod Arbor Tree Consultancy & Services Limited
Samuel Ma
Samuel Ma
Term Expires August 2023
Hong Kong
Director, Consulting Arborist & Climbing Specialist Kassod Arbor Tree Consultancy & Services Limited

Samuel serves as the Director, Consulting Arborist & Climbing
Specialist ofKassod Arbor Tree Consultancy & Services Limited
(Hong Kong) & EmCypress Arborist Consultancy Limited
(Taiwan). Also, he teaches the Higher Diploma Program of Tree
Management & Conservation at Hong Kong Institute of Vocational
Education, VTCHK, aimed to teach the proper practices and
manner to the youngster besides of the regular Arborist works. On
the other side, Samuel speaks fluently in three languages including
English, Cantonese and Mandarin, and fair in Japanese. He was invited by various University, Institute, organization to provide the Arboriculture training, teaching, sharing in different countries such as Hong Kong, Taiwan, China, Japan, Malaysia, Singapore, Australia, United States, etc.

Samuel Ma holds BSc degrees in Applied Biology from Hong Kong Baptist University, and now going back to the Faculty for his tree related research study. He is also an ISA Master Certified Arborist, Certified Tree
Worker - Climber Specialist, Qualified Chainsaw and Pruning (Ground) Technician and Tree Risk Assessment Qualified.

Samuel chaired the Tree Climbing Competition Committee from 2013 to 2015, and also as the member of the chapter's certification committee since 2013 and also. He helps the local Chapter development from 2013 and being the Board of Director since 2015. He has been the Asia Pacific Tree Climbing Championship Operations Committee since 2014. He is also the convener of The Hong Kong Institute of Professional Arborists, and also serves as the committee of Arboriculture & Horticulture Industrial Specification of Competency Standards helping to set up the local qualification framework. He enjoys being a travel Arborist helping the development of tree industry. Besides of the works, Samuel is also
a tree climbing athlete for organizing and participating various Tree Climbing competition and related activities in the world.

Shirley Vaughn
Shirley Vaughn
Term Expires August 2023
Ohio, USA
Business Developer, Davey Resource Group, Inc.
Shirley Vaughn
Shirley Vaughn
Term Expires August 2023
Ohio, USA
Business Developer, Davey Resource Group, Inc.

Shirley Vaughn is as business developer for Davey Resource Group,
Inc., a contractor which offers natural resource planning and
management services throughout the United States. For Davey,
Shirley’s works focuses on helping local governments with urban
forestry projects and program development. She develops scopes of
work, responds to requests for information, consults, and helps to
develop promotional materials and market services.

Shirley previously worked as regional grant administrator for the Florida Division of Forestry and as park manager and natural resource specialist for Broward County, Florida. She also currently serves as the Executive Director of the Women's Ohio State Golf Association, as a volunteer. Shirley holds BS and MS degrees in Geology from University of Iowa and is certified in Natural Lands Management through the University of Florida Institute of Food and Agricultural Sciences (IFAS) and The Nature
Conservancy. She has been an ISA member and an ISA Certified Arborist® since 2009 and Municipal Specialist® since 2011.

Shirley is a Past President of the Ohio Chapter of the ISA where she helped to streamline the Ohio Chapters™ operations and procedures and promote career opportunities in arboriculture by instituting the "Career Spotlight" in the Buckeye Arborist. She served on several committees for the Ohio Chapter including the Finance, Membership, and Leadership committees, and was the Local Chair for the ISA's International Conference held in Columbus, Ohio in 2018. Shirley was also the committee chair for the Ohio Tree Care Conference. When living in Florida, she was a board member of the Florida Urban Forestry Council and Greenscape of Jacksonville. In addition to urban forestry, Shirley enjoys golfing, hiking, gardening, and RVing.

John Coles
John Coles
Term Expires August 2024
Oslo, Norway
Tree Officer The Royal Court of Norway
John Coles
John Coles
Term Expires August 2024
Oslo, Norway
Tree Officer The Royal Court of Norway

John Coles is employed as the Senior Tree Officer to the Royal Court of Norway. He is responsible for the management and maintenance of the historic tree population that grows on the Royal estates. The largest of these areas being The Royal Palace Park in central Oslo.

John also works part time as an arboricultural tutor and climbing instructor at Norway's Only State Arborist school.

He has been an ISA Certified Arborist® for 20 years and is TRAQ
qualified. ISA Board of Directors Nominee

John's strong interest in practical arboriculture has led to his involvement in several of ISA's
committees over the past years. He is a former member of ISA's ETCC committee and a present member of ISA's ITCC, ISC and rules committee, and he is also a former ITCC competitor. In his own chapter, John is a member of the Norwegian tree-care forums educational committee and is also an exam sensor.

When not involved with tree projects John likes riding his motorcycle and spending time with
his wife and two daughters.

Carlos Llanos
Carlos Llanos
Term Expires August 2024
Valle del Cauca, Columbia
CEO ASFOR Group Cali
Carlos Llanos
Carlos Llanos
Term Expires August 2024
Valle del Cauca, Columbia
CEO ASFOR Group Cali

Carlos has been active for 16 years as an ISA Certified Arborist®, contributing his technical and scientific knowledge to the improvement of national standards for forest management, and the
development of the arboriculture industry. His contributions and management have been of vital importance to encourage and disseminate the concepts and criteria of arboriculture in Colombia
and Latin America, thanks to his diverse contributions, since the creation of the Colombian association of arboriculture ACA, as well as his collaboration in the creation and strengthening of arboricultural associations in Ecuador, Brazil, and Peru.

As well as the creation of the Latin American Institute of Arboriculture, he has been a tireless multiplier of technical concepts, through the training of hundreds of prospects, in the arboriculture industry, both in Colombia, El Salvador, Peru, Ecuador, and Brazil. Carlos has also served as a professor at the district University of Bogotá and the University of the Valley, thus contributing to the training of new forest engineers, and contributing to the generation and definition of national climbing standards, and themanagement of urban trees from the country.

His contributions in the area of research have been very important for the management of vegetation
associated with electric networks and urban trees. Carlos has been the executive director of his
business group, ASFOR Group for15 years, which is considered as the leading business group in the
execution of cutting-edge arboriculture activities in Colombia.

Randall H. Miller
Randall H. Miller
Term expires August 2024
Syracuse, Utah, USA
Director, Research and Development-CNUC
Randall H. Miller
Randall H. Miller
Term expires August 2024
Syracuse, Utah, USA
Director, Research and Development-CNUC

Randall H. Miller serves as Director of Research and Development at CNUC. He is responsible for conducting utility vegetation management research (UVM), providing subject matter expertise to
utility vegetation management programs across North America, benchmarking UVM programs against CNUC industry surveys, and serving as an expert witness in vegetation management litigation.

Randall has a broad arboricultural and urban forestry background having previously served as Club Arborist at Medinah Country Club in Medinah, Illinois, Wasatch Front Community Forester for Utah State Lands and Forestry, and as an Area Forester and System Forester/ Director of Vegetation Management for PacifiCorp, an electric utility serving parts of California, Idaho, Oregon, Utah, Washington and Wyoming. He holds a BS degree in Horticulture from the University of Wisconsin - Madison and an MS in Urban Forestry from the University of Wisconsin - Stevens Point. He has been an ISA member since 1987 and has been an ISA Certified Arborist® since 1990. He is an ISA Board Certified Master Arborist® and an ISA Certified Utility Specialist™ .

Randall has been Chair of the TREE Fund Board of Trustees, President of the Utility Arborist Association (UAA), Chair of the Edison Electric Institute Vegetation Management Task Force, and President of the Oregon Community Forest Council. He has served on the ISA Certification Test Committee, the ISA Editorial Board and the ISA Appeal's Committee.

He is the ISA 2005 R.W. Harris Authors Citation award recipient, in addition to the 2001 UAA Utility
Arborist Award, 2007 UAA President's Award, 2007 Pacific Northwest Chapter ISA President's Award, 2008 Utah Chapter ISA Distinguished Service Award, 2011 UAA Education Award and 2017 Utah Chapter ISA Lifetime Achievement Award.

He has more than 75 published writing credits, including the ISA Integrated Vegetation Management
Best Management Practices and, as coauthor with Geoff Kempter, Utility Arboriculture: The Utility
Specialist Certification Study Guide. Randy is an accomplished speaker and has delivered hundreds of presentations on arboricultural topics over three decades. Randy is also an eight-time Tour des Trees rider and has raised over $60,000 for TREE Fund.

Touchi Tadashi
Touchi Tadashi
Term Expires August 2025
Teijyuen Co.,Ltd
Touchi Tadashi
Touchi Tadashi
Term Expires August 2025
Teijyuen Co.,Ltd

Touchi Tadashi is a Japanese tree doctor, landscape architect and researcher.  He was born in 1967 into a family managing a landscape and tree care company, Teijyuen Co.,Ltd. established in 1877.  He proceeded to study Environmental Green Planning in Chiba University.  After completing his bachelor study, he worked for a famous modern Japanese garden architect, Yoshikuni Araki.  Three years later, he moved to the US for studying Landscape Architecture.  After graduating from the MLA of Louisiana State University, he returned to Japan to manage Teijyuen Co.,Ltd.   

While managing the company, he was certified as a Tree Doctor in 2009 and as a Street Tree Pruning Instructor in 2011.  Touchi has also worked with various landscape and tree care associations to further their objectives.  He has been selected jurist of several landscape awards and qualifications.  

Abroad, he is a Japanese delegate to the AIPH (International Association of Horticultural Producers) which certify international flower and garden expositions.  While visiting other countries for meetings, he has researched and interviewed street tree managers.  Recently he co-authored a book titled “Gairoju Ha Toikakeru” or “Street Trees are Calling”, in which he introduced the street tree management systems of the US and Germany.  Touchiʼs ongoing mission is to incorporate urban forestry into Japan for the betterment of future generations. 
 

Susan Day
Susan Day
Term Expires August 2025
Vancouver, BC Canada
University of British Columbia
Susan Day
Susan Day
Term Expires August 2025
Vancouver, BC Canada
University of British Columbia

Susan is a Professor of Urban Forestry in the Department of Forest Resources Management at the University of British Columbia in Vancouver, Canada and Program Director for the Bachelor of Urban Forestry degree. Before coming the UBC, Susan was a faculty member at Virginia Tech in the Department of Forest Resources and Environmental Conservation. She has been a member of the ISA since the early 1990s and has a career of service to the organization. Susan’s research focuses on managing urban soils to enhance tree growth and longevity in the context of environmental challenges such as stormwater mitigation and land development impacts on soil-mediated ecosystem services. She helped shape the soils metrics for the Sustainable Sites Initiative (SITES®) international crediting system for sustainable design projects and developed Soil Profile Rebuilding, a rehabilitation technique to restore damaged urban soils in situ and enhance urban soil carbon storage. Her research in the water relations of trees in engineered soil systems and in partnership with the Chesapeake Bay Trust has informed storm water policy in the Chesapeake Bay region of the United States. Susan also led Urban Forestry 2020, a research-based investigation into urban forestry career paths and education. 

In addition to research and guiding UBC’s urban forestry program, Susan enjoys teaching and working with students. She currently teaches Arboriculture Principles and Practice and Ecology of Urban Green Infrastructure. Susan has published more than 150 articles and book chapters on urban forests and urban soils and is the 2017 recipient of the L.C. Chadwick Award for Arboricultural Research. Susan holds a B.A. from Yale University, a M.S. from Cornell University, and a Ph.D. from Virginia Tech.

Susan is currently a member of the Pacific Northwest Chapter of the ISA (PNW-ISA) and was a long-time member of the Mid-Atlantic Chapter (MAC-ISA) until 2019. She is also a member of the American Society of Consulting Arborists, the Society of Municipal Arborists, the Ecological Society of America, the Soil Science Society of America, and the Canadian Institute of Forestry. She is also a SITES Accredited Professional and former long-time member of the Society of American Foresters.