He has been Professor of Theoretical Geophysics and Foundation Director, Institute of Theoretical Geophysics, at the University of Cambridge, since 1989 and Fellow of King's College, Cambridge, since 1970.
Since 1989, he has held the position of Professor of Theoretical Geophysics and serves as the director of the Foundation for the Institute of Theoretical Geophysics at the University of Cambridge. He was also elected a Fellow of King's College, Cambridge, in 1970.