The International Society of Arboriculture

The International Society of Arboriculture (ISA) is a professional organization dedicated to the study, management, and preservation of trees. It supports arborists—experts trained in tree care—by providing education, certification, research, and standards to ensure healthy and safe urban and natural environments. The ISA promotes best practices for tree care, advocates for the benefits of trees, and fosters a global community of tree professionals committed to sustainable and responsible arboriculture.