He returned to Cambridge in 1967 as an assistant director of research at the Cavendish Laboratory, becoming a reader in physics in 1972 and a full professor in 1974, a position he held until he retired in 2007.
He returned to Cambridge in 1967 as an assistant director of research at the Cavendish Laboratory. He was becoming a reader in physics in 1972. He was becoming a reader in a full professor in 1974. A reader in physics in 1972 and a full professor in 1974 were a position. Until he retired in 2007 a position. This was what he held.