Founded in 1902 and comprising more than 600 pre-law, law school, and alumni chapters worldwide, Phi Alpha Delta is the oldest and largest professional law fraternity in the United States. Prominent PAD members have included U.S. Presidents, Supreme Court Justices, governors, and members of Congress. PAD's District XXIII, which includes the Washington, D.C., Maryland, and northern Virginia region, is one of the fraternity's largest and most active districts.