Jonathan Mason

I’m an ISA Certified Arborist with over 15 years of experience in urban forestry and environmental policy.

I work in this field because I care deeply about the role of trees in urban life. In my career, I have published peer-reviewed research, led urban forestry programs, and managed field crews to plant and maintain trees throughout Los Angeles.

I offer consulting arborist services to clients who need reliable information to manage their trees.

Green and yellow certification badge for a 'Certified Arborist' from the ISA, featuring a stylized tree leaf illustration.

ISA Certified Arborist WE-13025A

ISA Tree Risk Assessment Qualified

Columbia University, MPA, Environmental Science and Policy