About us

We are pleased to announce the grand opening of the Pacific Northwest Arborist Alliance in Portland, Oregon. Founded in 2026 by ISA Certified Arborist Adam Haas & his wife Amy Gerassimoff. Our alliance was formed to offer you expert level tree care assessments from the areas leading arborists & tree care workers who pride themselves on the highest quality of care. We will offer you honest, ethical and insightful evaluations so that you can make the most informed choices to protect your assets. Our goal is to establish long term relationships in our community built on trust and dependability.