Health / Risk Assessment
Permits, Plans, Reports
Vegetation Inventory
Infrastructure & Trees

Appraisals & Expert Witness
Specialty Projects
Training, Research, Education
     Join us on Facebook
Seattle      206-528-4670

Appraisals & Expert Witness

Expert Witness

An Expert Witness is allowed to give opinions in a trial or hearing due to specialized knowledge in a scientific or technical field; in this case, the field of arboriculture.Registered Consulting Arborists Scott D. Baker and Sean Dugan have had expert witness training through the American Society of Consulting Arborists, as well as experience testifying in court, depositions, and hearings. Scott has been an expert in over 60 legal cases since 1997. Sean has been an expert in over 20 legal cases since 2008.

Both are well respected for their superior communication skills and pragmatism. Many of our clients have been able to settle before going to trial; however, in the cases that have gone to trial, Both Scott and Sean have proven to be articulate and knowledgeable under cross-examination. Before agreeing to act as an expert witness, Scott or Sean will want to discuss your situation with you or your attorney. Please contact us for more information.


We provide accurate valuations and appraisals of trees and plants for insurance claims, legal cases, or other needs. We use the Council for Tree and Landscape Appraisers Guide to Plant Appraisal, 9 Edition, which is considered an industry standard. We have used the Trunk Formula Method with success in numerous legal cases. We also use other methods when appropriate including the Replacement Cost Method and Cost of Cure Method. We are familiar with other methods of plant valuation not included in the Guide to Plant Appraisal, such as timber appraisal.

Our firsthand experience developing and managing bids for tree work and restoration projects allows us to make accurate replacement and restoration cost appraisals.