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About ISA Michigan ISA Michigan Formerly ASM is the Michigan Chapter of the International Society of Arboriculture the organization that provides certification for arborists. We are a nonprofit organization founded in 2006 under the idea to promote arboriculture in the state of Michigan. Our members include arborists urban foresters municipal and utility foresters professional tree workersclimbers academia and others interested in all aspects of arboriculture and the health and care of Michigan trees. Industry Organizations .