American College of Obstetricians and Gynecologists (ACOG)

Founded in 1951, ACOG became the specialty's first enduring, nationwide, democratic, professional membership organization. Based in Washington, DC, ACOG is a 501(c)3 nonprofit organization with more than 51,000 members and is the leading group of physicians in the U.S. providing health care for women. Board certification in ob-gyn is a requirement to become an ACOG Fellow, and more than 90 percent of American board-certified ob-gyns are affiliated with ACOG. ACOG members include both generalists and subspecialists in areas such as maternal-fetal medicine, gynecologic oncology, reproductive endocrinology and urogynecology.