Postdocs from various national and international origin working in the multiple laboratories in the sciences, social sciences, humanities, and professional schools of the university. The university progressively recognized this working force with the recent creation of the Office for Postdoctoral Affairs and the Yale Postdoctoral Association. Campus life Yale is a research university, with the majority of its students in the graduate and professional schools. Undergraduates, or Yale College students, come from a variety of ethnic, national, socioeconomic, and personal backgrounds. Of the 2010–2011 freshman class, 10% are non‑U.S. citizens, while 54% went to public high schools. The median family income of Yale students is $192,600, with 57% of students coming from the top 10% highest-earning families and 16% from the bottom 60%. Residential colleges Yale's residential college system was established in 1933 by Edward S. Harkness, who admired the social intimacy of Oxford and Cambridge and donated significant funds to found similar colleges at Yale and Harvard. Though Yale's colleges resemble their English precursors organizationally and architecturally, they are dependent entities of Yale College and have limited autonomy. The colleges are led by a head and an academic dean, who reside in the college, and university faculty and affiliates constitute each college's fellowship. Colleges offer their own seminars, social events, and speaking engagements known as "Master's Teas," but do not contain programs of study or academic departments. All other undergraduate courses are taught by the Faculty of Arts and Sciences and are open to members of any college. All undergraduates are members of a college, to which they are assigned before their freshman year, and 85 percent live in the college quadrangle or a college-affiliated dormitory. While the majority of upperclassman live in the colleges, most on-campus freshmen live on the Old Campus, the university's oldest precinct. While Harkness' original colleges were Georgian Revival or Collegiate Gothic in style, two colleges constructed in the 1960s, Morse and Ezra Stiles Colleges, have modernist designs. All twelve college quadrangles are organized around a courtyard, and each has a dining hall, courtyard, library, common room, and a range of student facilities. The twelve colleges are named for important alumni or significant places in university history. In 2017, the university opened two new colleges near Science Hill. Calhoun College Since the 1960s, John C. Calhoun's white supremacist beliefs and pro-slavery leadership had prompted calls to rename the college or remove its tributes to