Nigel Smith (English)
December 22, 2003
Nigel Smith (English)
June 6, 2006
Nigel Smith (English), Sarah Anderson (English), Hans Aarsleff (English)
November 13,2008
Nigel Smith (English), Mirjam Kunkler (Near Eastern Studies), Roman Rafikov (Astrophysics), Celeste Nelson (Chemical Engineering), Philippe Rigollet (Operations Research and Financial Engineering)