other academic appointments include professeur d'echange at the university of paris (1977), gastprofessur at the eidgenossische technische hochshule (eth), zurich (1994, 1995, 1997, 2000, 2002, 2004, 2006, 2008, 2010), and david p. craig visiting professor at the australian national university (1999). in 2004 he became professor of chemistry, emeritus, at uc berkeley.