The Hebrew University of Jerusalem is Israel's second oldest university, established in 1918, 30 years before the establishment of the State of Israel. The Hebrew University has three campuses in Jerusalem and one in Rehovot. The world's largest Jewish studies library is located on its Edmond J. Safra Givat Ram campus. The university has 5 affiliated teaching hospitals including the Hadassah Medical Center, 7 faculties, more than 100 research centers, and 315 academic departments. As of 2018, a third of all the doctoral candidates in Israel are studying at the Hebrew University. The first Board of Governors included Albert Einstein, Sigmund Freud, Martin Buber, and Chaim Weizmann. Four of Israel's prime ministers are alumni of the Hebrew University. As of 2018, 15 Nobel Prize winners, 2 Fields Medalists, and 3 Turing Award winners have been affiliated with the University.