John Hans Bornsworth

John Hans Bornsworth, Board Certified Master Arborist, Registered Consulting Arborist, Tree and Plant Appraisal Qualification is a consulting arborist and ecological forensics expert specializing in tree valuation, tree risk assessment, and environmental litigation support. With a career encompassing urban forestry management, ecological forensics, and arboriculture, he brings a multidisciplinary approach to complex environmental and arboricultural disputes. His work centers on investigating tree failures, assessing ecological impacts, and evaluating whether industry standards were met in cases involving tree valuation, environmental mitigation, and construction impacts.

Mr. Bornsworth has been retained in numerous expert witness and consulting engagements across Washington, Oregon, Colorado, and Michigan, involving cases of tree failure, environmental mitigation, and urban forestry policy. His Board Certified Master Arborist designation from the International Society of Arboriculture, along with his Registered Consulting Arborist and Tree and Plant Appraisal Qualification certifications, reinforce his ability to deliver objective, defensible analyses. He is regularly engaged by both plaintiff and defense counsel to provide clear, independent determinations of causation and standard of care in disputes involving tree risk, ecological impacts, and arboricultural practices.