The American Psychological Association (APA), headquartered in Washington, D.C., is the largest scientific and professional organization representing psychology in the United States and the world's largest association of psychologists. The APA's membership includes more than 150,000 researchers, educators, clinicians, consultants, and students. Through its divisions in 53 subfields of psychology and affiliations with 60 state, territorial, and Canadian provincial associations, the APA works to advance psychology as a science, as a profession, and as a means of promoting health, education, and human welfare. The association's annual convention, held in late summer, is the world's largest meeting of psychologists.

The APA members sit on association boards, committees, and task forces and work with colleagues to shape policies for the association and to develop standards regarding psychological research, ...