From wikipedia:

The Academy of Motion Picture Arts and Sciences (AMPAS) is a professional honorary organization with the stated goal of advancing the arts and sciences of motion pictures. The Academy's corporate management and general policies are overseen by a Board of Governors, which includes representatives from each of the craft branches.

The roster of the Academy's approximately 6,000 motion picture professionals is a "closely guarded secret". While the great majority of its members are based in the United States, membership is open to qualified filmmakers around the world.