Terrence P. Flanagan, Principal & consulting arborist 


Recently named a "True Professional" by the International Society of Arboriculture (ISA) for his lifetime of work in the Arboricultural field, Terry Flanagan lives, breaths, and sleeps trees.  So much so, that every dog of his has been named after trees, with Hemi being the current Teragan mascot.  President of the ISA, President of the local PNW-ISA Chapter,  Chair and member of countless committees, Educator for growing Arborists and a legion of contributions - all dedicated to Arboriculture.  He is a Board Certified Master Arborist, Tree Risk Assessment Qualified, and one of the select few serving as an Expert Witness for Tree-related litigation. Terry is a resolute Arborist serving the industry for over 40 years!


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Todd Prager, Senior associate & Consulting arborist

Todd Prager is an ISA Board Certified Master Arborist, ASCA Registered Consulting Arborist and an American Institute Certified Planner with the American Planning Association. Todd has over 15 years experience working with public agencies and private organizations in Arboriculture and Urban Forestry.  His background in Urban Planning makes him the leading Arborist for providing clients the most efficient options for obtaining land-use approval when trees are at issue for development projects.


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Suzanne e. spencer, lead associate & consulting arborist

Joining Teragan & Associates, Inc. in 2017, Suzie has come full circle to work for her mentor who introduced her to Arboriculture ten years ago...Terry Flanagan!  Suzie is a Horticulturist,  International Society of Arboriculture Certified Arborist, Tree Risk Assessor Qualified, EcoPro sustainable landscape management professional, and Founder of an award-winning local landscape and tree management business that set the standard for organic land management on the west coast.  Her background in natural system modeling land care, research-based landscape management and design, and environmental stewardship provides clients a tree management and planning perspective that is efficient and sustaining.