As of 2018, distinguished alumni and/or Trustees include three U.S. Supreme Court justices, 32 U.S. senators, 46 U.S. governors, 163 members of the U.S. House of Representatives, eight signers of the Declaration of Independence and seven signers of the U.S. Constitution (four of whom signed both representing two-thirds of the six people who signed both), 24 members of the Continental Congress, 14 foreign heads of state, and two presidents of the United States. As of October 2019, 36 Nobel laureates, 80 members of the American Academy of Arts and Sciences, 64 billionaires, 29 Rhodes Scholars, 15 Marshall Scholars, and 16 Pulitzer Prize winners have been affiliated with the university.