The Graduate School of Arts and Sciences is the largest of the twelve graduate schools of Harvard University. Formed in 1872, GSAS is responsible for the majority of Harvard's post-baccalaureate degree programs in the humanities, social sciences, and natural sciences. The school offers Master of Arts, Master of Science, and the Doctor of Philosophy degrees in approximately 56 disciplines.Academic programs offered by the Harvard Graduate School of Arts and Sciences have consistently ranked at the top of graduate programs in the United States. The school's graduates include a diverse set of prominent public figures and academics. GSAS has produced the vast majority of Harvard's Nobel Prize-winning alumni. In addition to scholars and scientists, GSAS graduates have become U.S. Cabinet Secretaries, Supreme Court Justices, foreign heads of state and heads of government.History and organizationGSAS was formally created as the Graduate Department of Harvard University in 1872 and was renamed the Graduate School of Harvard University in 1890. Women were not allowed to enroll in GSAS until 1962.