My Profile

Gilles Tree Consulting


My services include but are not limited to: Municipal Tree Analysis, Development Site Planning, Tree Risk Assessment, Urban Forest Management Planning, Management and Master Planning for Parks, Greenbelts and Open Spaces, Tree and Shrub Appraisals, Tree Protection and Removal Plans, Selection of Appropriate Trees & Shrubs for Planting.


University of Idaho, College of Forestry, Moscow, ID. Bachelor of Science in Wildland Recreation Management, Interpretation/Communications Option. Graduated Cum Laude May 1981. Curriculum centered on basic sciences and natural resource management with a communications/education option.

Lowry Air Training Center, Instrumentation Mechanic School, Lowry AFB, Denver, CO. Certificate of Completion, June 1974. 34 college semester credit hours of electronic fundamentals, computer programming and repair.


The American Society of Consulting Arborists, Registered Consulting Arborist # 418, January 7, 2004 through 2013.

The International Society of Arboriculture, Certified Arborist # PN-0260A, October 1992 through December 31, 2013.

The Pacific Northwest Chapter of the International Society of Arboriculture, Certified Tree Risk Assessor # 148, October 2006—2014.


The American Society of Consulting Arborists Annual Training Conferences, 2003—2008, & 2010. Consulting Academy, Rosemont, IL March 2002.

The International Society of Arboriculture (ISA)
* Pacific Northwest Chapter Annual Training Conferences, 1993—2002, 2004, 2005, 2008—2010.
* The ISA International Training Conference, 2002.

The National Recreation & Park Association
* Risk Management School, Seattle, WA. January 1991 – 1996, & 2000
* Resource Management School, Fort Worden State Park, WA 1986 & 1988.

Washington State University Cooperative Extension, Pullman, WA
* Turf Grass Institute, 1983 & 1985
* Pesticide Training & Rectification Courses, 1985 – 1999.


The National Expert Witness Seminar, Hyannis, MA, June 2005.
The National Arbor Day Foundation & The National Association of Home Builders: Building With Trees, March 2000.
Context Associated: Program Leader Training, November 1997 through December 1998.
The Excellence Series, August through December 1992 Leadership Skills Training, February through April 1993.
The International Northwest Parks & Recreation Association, Annual Training Institutes, 1986, 1987, 1991–1993.


Pacific Northwest Chapter of the International Society of Arboriculture Duties: Instructor of the Tree Risk Assessment Certification Course. 2007 to present.

Lake Washington Technical College, Kirkland, WA, January through March 2005 – 2008 Duties: Instructor in the Department of Environmental Horticulture, Topics in Arboriculture, HORT 13—a 3-credit class for landscape and tree professionals to prepare individuals for the ISA Certified Arborist exam.

Gilles Arboricultural Consulting, Kirkland, WA. February 1993 to the present Position & Duties: Owner. Provide tree evaluations and recommendations for private, commercial, and municipal clients that include tree evaluations for subdivisions, road projects, office buildings, parking lots, multi-family projects, and individual homes, tree risk assessments, site analysis and development review, urban forest planning and wildlife management. I work with clients in different local municipalities and counties so clients can comply with required codes to accomplish their goals. I provide appraisals of trees, shrubs, and landscape amenities. Current regular customers include: local municipalities, a school district, landscape architecture firms, home owners, property managers, developers, engineering firms, contractors, and home-owner associations.

City of Mercer Island, WA. January 1999 through August 2000: Position & Duties: City Arborist/Natural Resources Manager. Hazard Tree Evaluations of trees on public property, evaluation and approval of site development plans, design and construction consulting on City Capital Improvement Projects, Liaison to the Tree and Natural Resources Management Task Force developing a new element for the City Comprehensive Plan, presentations to boards, commissions and the City Council on tree and natural resources issues.

City of Mercer Island, City of Mercer Island, WA. January 1997 through January 1999. Position & Duties: Right-of-Way Team Leader/Natural Resources Manager, Maintenance Department. Management and repair of City roads, pedestrian and bicycle facilities, street trees, greenbelts, open spaces and undeveloped rights-of-way. Hazard Tree Evaluation on all public property, consultant to the Development Services Department regarding tree retention on construction sites as well as Capital Improvement Projects. Managed a work crew of six permanent and four temporary employees.

City of Mercer Island, City of Mercer Island, WA. July 1991 through January 1997. Position & Duties: Environmental Team Leader/Natural Resources Manager: A. Management and repair of all park facilities and natural areas. Plan, organize, coordinate and manage maintenance programs for over 350 acres of developed parks, open-spaces, planter beds and green belts. Work included acting as the City Arborist evaluating trees for health, safety, retention or removal. B. Work also included sitting on the City’s design and management team for a three year downtown renovation of streets and sidewalks. My role on the team was to work with all parties to ensure the survival of the mature and newly installed street trees. C. The I-90 Corridor Tree & Landscape Maintenance Project: 1992 – 1997. Manager in charge of the turn-back process in which Washington State Department of Transportation turned over the management of $24 million worth of parks and landscaping to the City. I verified completion of the projects to design specifications and developed and implemented a maintenance management program for the complex site.

Parks and Recreation Department, City of Redmond, WA. January 1988 through July 1991. Position & Duties: Park Operations Supervisor. Plan, organize, coordinate, and manage maintenance programs I assisted in the development and management of the annual budget through the entire process from conception, through adoption and implementation. I conducted annual staff performance reviews.

Whitman County Parks & Recreation Department, Colfax, WA. March 1982 to January 1988. Position & Duties: Operations Coordinator/Park Manager. Plan and manage the day-to-day operations of the County Park system; evaluate trees in parks for health and safety, develop and execute site restoration plans and the annual tree planting program; prune and remove trees as needed, plan organize and execute recreation programs; development and execution of a weed and pest control system.

Whitman County Parks & Recreation Department, Colfax, WA. Summer seasons of 1979—1981. Position & Duties: Park Naturalist/Maintenance Crew Supervisor. A. Planning and management of a staff of seven workers in the daily maintenance and operation of all county park areas. This was a working supervisor role that included woodcutting, tree removal, and equipment maintenance. B. Planning and operating various recreation and public relations programs such as: nature walks, evening campfire programs, 4-H camp director, day camp counselor, historic tours, writing press releases.

Winchester Lake State Park, Idaho State Parks Department, Winchester, ID. April 1978 through October 1978. Position & Duties: Park Aide/Intern, tree removal, maintenance of park facilities and equipment, law enforcement, fee collection, preparing and presenting campfire programs.

College of Forestry, Wildlife and Range Sciences, University of Idaho, Moscow, ID. From August 1978 through May 1981 each school term. Position & Duties: Professor’s Assistant, Media Lab Supervisor, Research Assistant. Production of information exhibits, visual aides and automated multimedia programs used in federal, state, county, and city agencies.

United States Air Force, Holloman Air Force Base, New Mexico. September 1973 through June 1977. Position & Duties: Airborne Instrumentation Mechanic. Computer programming and operation to perform ground and flight testing of inertial navigation systems, radar systems, associated telemetry, and related test facilities.


National Recreation and Parks Association, * The Resource Management School, Fort Worden State Park, Port Townsend, WA. February 2001 – 2010. * 3 hour seminar for park management professionals about managing park trees safely. * The Southwest Maintenance Management School, The UCLA Lake Arrowhead Conference Center, Lake Arrowhead, CA. November 2003, – 2009: * 2.5 hour seminar each year for park management professionals about managing park trees safely. * 1.5 hour seminar each year for park management professionals teaching basic concepts of Urban Forestry and how they support park management.

The High Desert Green Industry Conference, February 11 & 12, 2009, Presentation at the annual training and recertification conference. Redmond, OR. Seminar: An Overview of Plant Appraisal – and Why You Should Care, A review of different tree, plant, and landscape losses to see how professional plant appraisers develop dollar value for plants and landscapes. Seminar: Gardens and Trees of France, A travelogue of some amazingly beautiful gardens designed and built by European nobility and maintained for centuries. Also, mixed in between gardens are discussions of interesting trees and their management in France.

The Washington Association of Code Enforcement Officers, September 2001, Presentation at the annual training conference. Leavenworth, WA Seminar: The Role of Certified Arborists in Assisting Code Enforcement Officers in Case Documentation and Tree Appraisal.

National Recreation and Parks Association, February 2000, 2001, and 2003, The Pacific Risk Management School, Seattle, WA. * Seminar: Trees and Trails, Their Maintenance and Safety. * Tour Leader: Risk Management Applied to Field Circumstances. National Recreation and Parks Association, October 1999, Annual Training Congress, Nashville, TN: 3-hour seminar on Managing Hazardous Trees to Enhance Urban Wildlife Opportunities.

The 4th International Symposium on Urban Wildlife Conservation, Sponsored by the Arizona and New Mexico Wildlife Associations and the University of Arizona, Tucson, AZ, May 1999: Presentation titled, “Tree Cutting & Pruning to Benefit Urban Wildlife.”

International Society of Arboriculture Victoria, British Columbia, Canada, October 1994 Annual Training Conference: Seminar on Hazard Tree Management and Wildlife Habitat Creation. * Whistler, British Columbia, Canada, October 1998: Poster Session on Urban Wildlife Opportunities for Arborists. * Boise, ID, October 2008, Training Academy: Tree Risk Assessment—Reading the Body Language of Trees.

Pacific Risk Management School, Seattle, WA, January 1996: Seminar on Effective Park Design and Hazard Tree Management in Parks.

Multiple speaking opportunities at various local schools, garden clubs, and organizations on a variety of tree and natural resource topics.


The American Society of Consulting Arborists Board of Directors, 2011 – 2014.

Lake Washington Technical College Environmental Horticulture Advisory Committee, 2003 – 2011.

Board of Regents, National Recreation & Park Association, Risk Management School, 1992 – 1996, & 2000.

Board of Directors, Public Outreach Director, The Pacific Northwest Chapter of the International Society of Arboriculture, 2001 – 2005.

Volunteer Coordinator, The International Society of Arboriculture Annual Training Conference in Seattle, WA—Coordinating over 200 volunteers for a conference of over 2,400 attending delegates. July 2002.


Mid-Career Alumni Achievement Award, from the College of Natural Resources, at the University of Idaho. “Presented to alumni who have achieved professional responsibilities and/or leadership, achieved state and/or regional distinction among his or her peers. . .” April 2009.

Municipal Arborist of the Year, Awarded by the Pacific Northwest Chapter of the International Society of Arboriculture, October 1998.

Certificate of Achievement, from the Pacific Northwest Chapter of the Association of Interpretive Naturalists, October 1981.

Outstanding Senior Award, Wildland Recreation Management Department, College of Forestry, University of Idaho, May 1981.

Alumni Award For Excellence, from the University of Idaho Alumni Association for Outstanding performance in Academics and Campus Citizenship, 1980.

Pearson-Rettig Scholarship, for the outstanding senior in the College of Forestry with superior grades, 1980-81.

Elected President, Student Chapter of the Idaho Recreation Parks Society, 1979-80.

Richard Boice Recreation Award and Scholarship, for Outstanding Performance and contributions in the recreation field, 1979-80.

Henry Legoll Scholarship, for the outstanding junior in the College of Forestry with Superior Grades and Community Involvement. 1979-80.

Honor Student Recreation Award, from the Idaho Recreation and Parks Society for the Outstanding Student in the Recreation Field in the State of Idaho. 1979.

President, Wildland Recreation Student Association, College of Forestry, University of Idaho 1978-1979.

Accelerated Promotion, Holloman AFB, NM for Outstanding Performance and Leadership June 1976.

Outstanding Airman of the Quarter, Holloman AFB, NM. March 1976.

High School Honor Student, Honor Roll every semester in high school.

Eagle Scout, Awarded December 1970.