International Society of Arboriculture (ISA)

The International Society of Arboriculture (ISA) is a professional organization dedicated to promoting the health, safety, and sustainability of trees through education, research, and certification. It supports arborists—tree care specialists—by providing standards, resources, and scientific knowledge to ensure proper tree management. ISA also advocates for the importance of trees in communities and the environment, aiming to improve urban forestry practices worldwide. Members include certified arborists, educators, and professionals committed to advancing the art and science of tree care.