Sean Dugan, RCA


Sean is a senior arborist and urban forester with over 25 years’ experience assessing and managing trees, and people’s interactions with them. He is an expert diagnostician and investigator, and a leader of the Tree Solutions Inc. team. His specialties include construction management of tree retention plans, municipal permit review and code development, integrated pest management (IPM), advanced testing and analytics of tree structure and stability. He is an accomplished expert witness and has testified in cases including SEPA and MUP hearings, land use disputes, timber trespass, fire damage, and landscape appraisals. From housing developments to native plant restoration, his projects have seen it all.

Sean is passionate about being a father to his two girls. Other possible Sean sightings: sitting on the porch with his lovely wife, traveling to sport events, enjoying good food, and beach combing. Go Hawks!


MS in Forest Resources
(University of Washington 2004)

BS in Environmental and Forest Biology with emphasis in Wildlife Management
(State University of New York 1997)

Licenses and Certifications

  • ASCA Registered Consulting Arborist #457
  • ISA Board Certified Master Arborist PN-5459B
  • ISA Qualified Tree Risk Assessor (TRAQ)
  • Licensed Commercial Applicator WA #66733
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