 He is also a professorial fellow in the School of Physics, Melbourne University, and a distinguished visiting professor at Purple Mountain Observatory in Nanjing, China.From 1996 to 2002, he was a scientific editor with the Astrophysical Journal, and has later been an associate editor with The Astrophysical Journal Letters.He is also the chief editor of the Theoretical Astrophysics series of books at the University of Chicago Press.