among a number of songs commonly played and sung at various events such as commencement and convocation, and athletic games are: "York Song", sung to the tune "Harvard". Fraternities and sororities Fraternities and sororities are not recognized by York University. Phi Delta Phi (ΦΔΦ) international legal fraternity, at Osgoode Law School, was given special dispensation when the law school became part of the university, as the fraternity's history with the law school dated back to 1896, and is recognized at York. Notable people York has over 200,000 living alumni. Although a large number of alumni live in Ontario, a significant number live in British Columbia, Nova Scotia, Alberta, New York, and Washington, D.C. York also has over 25,000 alumni overseas. Distinguished research professors and university professors The ranks of "distinguished research professor" and "university professor" are the highest rank a professor can achieve at York University. There are only ever up to a maximum of 25 each of active distinguished research professors and active university professors at any time. It is awarded to members of the faculty who have made outstanding contributions to the university through their work in research. Pat Armstrong, 2010: Sociology, Liberal Arts & Professional Studies Isabella C. Bakker, 2014: Political Science, Liberal Arts & Professional Studies Norbert Bartel, 2006: Physics & Astronomy, Science Dawn Bazely, 2017: Biology, Science Ellen Bialystok, 2003: Psychology, Liberal Arts & Professional Studies Deborah Britzman, 2006: Education James Carley, 2000: English, Liberal Arts & Professional Studies Jean-Gabriel Castel, 1986: Osgoode Hall Law School Jerome Ch'en, 1984: History, Liberal Arts & Professional Studies Lorraine Code, 1998: Philosophy, Liberal Arts & Professional Studies J. Douglas Crawford, 2013: Psychology, Health Kenneth Davey, 1984: Biology, Science Sheila Embleton, 2009: Languages, Literatures & Linguistics, Liberal Arts & Professional Studies Stephen Gill, 2006: Political Science, Liberal Arts & Professional Studies Jack Granatstein, 1994: History, Liberal Arts & Professional Studies Leslie S. Greenberg, 2010: Psychology, Health Philip Gulliver, 1985: Anthropology, Liberal Arts & Professional Studies Henry S. Harris, 1984: Philosophy, Glendon Robert Haynes, 1986: Biology, Science Michael Herren, 1999: Humanities, Liberal Arts & Professional Studies Eric Hessels, 2006: Physics & Astronomy, Science Richard Hornsey, 2015: Electrical Engineering, Lassonde School of Engineering Ian Howard, 1988: Psychology, Liberal Arts & Professional Studies Allan Hutchinson, 2006: Osgoode Hall Law School Christopher Innes, 1997: English, Liberal Arts & Professional Studies Ian Jarvie, 1993: Philosophy, Liberal Arts & Professional Studies Michael Kater, 1992: History,