International Society of Arboriculture Email Format

Non-profit OrganizationsGeorgia, United States51-200 Employees

The International Society of Arboriculture is a nonprofit organization focused on advancing arboriculture through research, education, and professional practice. Since its founding in 1924, it has worked to demonstrate the economic, environmental, and societal value of trees and proper tree care to professionals, public officials, and consumers worldwide. It is based in Atlanta, Georgia, and is registered in Illinois as a 501(c)(5) nonprofit. The organization centers its activities on guiding principles such as research dissemination, public awareness, membership development, professional development, promoting the profession, and safety, positioning ISA as a global source of knowledge about tree benefits and care. It serves a broad network of practitioners, allied professionals, public officials, and other stakeholders, helping them address tree-related risks and steward resources wisely. In February 2025, ISA announced updates to its Tree Risk Assessment Qualification program.

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