Find a Certified Arborist NHAA Certified Arborists are up to date on the latest in arboricultural technology and knowledgeable of acceptable arborist practices. They must pass a comprehensive exam and then maintain their certification through continuing education. Related Links http://www.nharborists.org/nhaa-list-of-certified-arborists/ Topics Natural Resources Tags Caring for Yard & Street Trees Categories Forest & Trees Natural Resources