The American Chiropractic Association (ACA), based in Arlington, VA, is the largest professional association in the world representing doctors of chiropractic.

The National Institutes of Health (NIH), a part of the U.S. Department of Health and Human Services, is the primary Federal agency for conducting and supporting medical research.

The California Chiropractic Association (CCA), was established in 1928 and is a Sacramento-based, statewide, nonprofit organization. Their mission is Promoting high standards of professionalism and patient care through education, advocacy and accountability.