Dan is the founder of Oliver Arbor Care in Bend, Oregon and is a certified Certified Arborist, Qualified Tree Risk Assessor. He’s a second-generation ISA Certified Arborist (PN-7275AM), ISA Certified Municipal Arboriculture Specialist, and ISA Tree Risk Assessment Qualified. He’s been working with trees professionally since 2002 (unless, of course, we counted the pruning his dad had him doing as a kid, but we won’t count that.)