Contact Us
    Join us on Facebook

Seattle      206-528-4670
Portland     503-850-8266
Bend     541-797-1551


Scott D. Baker

Scott D. Baker, principal and founder, has worked with trees for over 40 years. He has extensive experience with construction, building codes, tree diagnosis, tree houses and zip lines. Scott utilizes his past experience as a successful developer to help bridge the gap between development and trees. He has extensive knowledge of tree biology and has partnered with several international scientists to help implement new tools and techniques in an effort to advance the use of science and technology in arboriculture. Scott is respected as a speaker and educator in tree diagnostics, tree preservation, and tree-supported structures. He is also certified to teach the ISA Tree Risk Assessment Qualification course internationally. He is a Registered Consulting Arborist (#414), Board Certified Master Arborist (#PN-0670B),and a Qualified Tree Risk Assessor.

Scott is an avid cyclist and has been a regular participant and supporter of the Tour des Trees www.tourdestrees.org - a 500+ mile annual bike ride to raise money for the TREE Fund (Tree Research and Education Endowment Fund) www.treefund.org. He enjoys skiing, sailing, and climbing of all kinds.

Sean Dugan

Sean Dugan, principal, specializes in tree biology and diagnostics, pest control, and municipal tree ordinances. He has experience working as an expert witness in timber trespass cases and those requiring appraisals of landscapes. He has over 17 years experience in design and implementation of landscape plans, native plant restoration, and site inspection and evaluation. He holds a Masters Degree in Forest Resources (University of Washington) and a Bachelor of Science in Environmental and Forest Biology with an emphasis in Wildlife Management (State University of New York). He is a Registered Consulting Arborist (#457), a Board Certified Master Arborist (PN-5459B), a Qualified Tree Risk Assessor, and is a Licensed Commercial Applicator in the State of WA (#66733).

Sean is passionate about photography and about being a dad to his two little girls: Kylie-Sean and Anyssa. Other possible Sean sightings: fishing, family BBQs, local hiking trails, in a tree, or sitting on the porch with his lovely wife.

Holly Iosso

Holly Iosso, senior associate, has over a decade of experience in the landscape industry, including landscape design, installation, maintenance and environmental education. She specializes in tree identification, inventory, restoration in environmentally critical areas, and garden design. Holly holds a Bachelor of Science degree in Landscape Architecture with a focus in Landscape Ecology (University of California, Davis) and an Associate of Science degree in Environmental Horticulture (South Seattle Community College). She is a Registered Consulting Arborist #567, Certified Arborist (PN-6298A) and ISA Qualified Tree Risk Assessor.

Holly actively gardens and loves plants of all sizes. She spends her free time digging in the dirt with her two young children, playing the guitar, and binge watching Masterpiece Theater.

Haley Galbraith

Haley Galbraith, senior associate, graduated from the University of Washington in 2012 with a B.S. in Environmental Science and Resource Management and has been an asset to our growing company since 2011. Her specialties include tree risk assessment, management planning, advanced decay testing, evaluation of trees as support structures, and municipal arboriculture. She serves as Secretary on the Board of Directors for the Pacific Northwest Chapter of ISA, and is a member of the Washington Community Forestry Council for DNR. Haley is an ISA Board Certified Master Arborist, Municipal Specialist, and Qualified Tree Risk Assessor (PN-7512BM). Additionally, she is licensed as a WSDA Commercial Operator (#86856).

Haley finds joy trail running and practicing yoga. She aspires to one day live self-sustainably in a permaculture setting.

Katie Hogan

Katie Hogan, associate, graduated from the University of Washington in 2012 with a degree in Environmental Studies. Katie has studied native forest dynamics and pathology in Washington, Oregon, California, and Utah. She specializes in plant pathogens, habitat quantification, native and rare plant identification, field sampling techniques, and fire ecology. She strives to practice interdisciplinary environmental management and hopes to increase community awareness through education and research. She is an ISA Certified Arborist (PN-8078A) and ISA Qualified Tree Risk Assessor.

In her free time you'll find Katie practicing yoga, mushroom hunting, hot air ballooning, listening to records, hiking, and caving.

Katherine Taylor

Katherine Taylor, associate, has a varied background including environmental consulting, restoration, education, and volunteer coordination. She holds a Bachelor of Fine Art (York University-- Toronto) and an Associate Degree in Restoration Horticulture (Edmonds Community College). She is an ISA Certified Arborist (PN-8022A), ISA Qualified Tree Risk Assessor, and Certified Professional Horticulturist

Out of the office, Katherine can be found restoring our local forests as a Forest Steward, remodeling her house, and cuddling with her canine friends.

J. Casey Clapp

Casey Clapp, associate, manages our Portland, Oregon office. He specializes in tree identification, urban forest management, tree diagnostics, and pine cones. He holds a Master of Science degree in Environmental Conservation with a focus in Forest Resources and Arboriculture (University of Massachusetts, Amherst) and a Bachelor of Science degree in Forest Management with a focus on Urban Forestry (Oregon State University). Casey serves on the ISA’s Conference Programs Committee, and has presented his research at international conferences including Toronto, Ontario, Milwaukee, Wisconsin, and Turin, Italy. He is an ISA Certified Arborist (PN-7475A) and is an ISA Qualified Tree Risk Assessor.

You may find Casey in coffee shops and concert halls across the Northwest.  He loves seeing live music, traveling, and riding his bicycle around new cities, and especially loves doing them all at once.   He also enjoys backpacking, Ultimate Frisbee, and expanding his collection of tree cones.

Chris Madison

Chris Madison, associate, manages our office in Bend, Oregon. He specializes in plant biology, advanced decay testing, and challenge course inspections. He holds a Bachelor's Degree in Philosophy (Trinity College, Connecticut) and Technical Degrees in Restoration Horticulture and Landscape Maintenance and Installation (Edmonds Community College).  He is an ISA Certified Arborist (PN-7671A) and Qualified Tree Risk Assessor.

Chris is a PSIA Level 3 ski instructor during the winter season and leaves us for a few snowy months every year. In his free time, he enjoys rock climbing, tree climbing and hiking.

Shannon O'Bent

Shannon O'Bent, operations manager, is a transplant from New York City, where she lived and worked for the last 10 years as a theatrical stage manager. She provides Tree Solutions with an invaluable perspective through her training outside of arboriculture, and applies her organizational management skills to help streamline the company's communications, workflow and quality control.

Outside of the office, Shannon sings and plays ukulele as a member of the band PepperJill and Jack, and plays electric bass with the Give Back Brass Band. She also finds time to tour three weeks every summer with The Flying Karamazov Brothers and the New Old Time Chautauqua, a nonprofit circus group whose mission is to build community through laughter and entertainment.