He was a member of the Department of General Philosophy from 1972 to 1986, and from 1986 to 1999 was the head of the Department of the History and Philosophy of Science at the University of Sydney, where he remains an honorary associate professor.
He was a member of the Department of General Philosophy from 1972 to 1986, and from 1986 to 1999 he led the Department of the History and Philosophy of Science at the University of Sydney, where he continues as an honorary associate professor.