ATP Affiliate Organizations

International Society of Arboriculture

The International Society of Arboriculture (ISA) was founded in 1924 and has served the tree care industry for over seventy years as a scientific and educational non-profit organization. ISA supports tree care around the world and is dedicated to the care and preservation of shade and ornamental trees. This organization continues to be a dynamic medium through which arborists around the world share their experiences and knowledge for the benefit of society. Aligned on many fronts with other green organizations, ISA is working hard to foster a better understanding of trees and tree care through research and the education of professionals as well as global efforts to inform tree care consumers.  

Visit their website here. 

Illinois Arborist Association

The Illinois Arborist Association is a non-profit organization that educates our members in proper tree care.  We support research on trees.  Our mission is to "Foster interest, establish standards, exchange professional ideas and pursue scientific research in Arboriculture."

Visit their website here.

Western Chapter of the ISA

The Western Chapter ISA is a member driven organization dedicated to fostering a greater appreciation for trees by promoting research and education to advance the professional practice of arboriculture. 

Visit their website here.