Spurned by both Cambridge and Oxford, Kiernan was offered a lectureship in 1948 at the University of Edinburgh, thanks to the intervention of the distinguished historian Richard Pares. In 1970, Kiernan was given a Personal Chair in Modern History; a position he held until his retirement in 1977. Having joined the CPGB in 1934, he finally left in 1959, chiefly in disgust at the suppression of the Hungarian Revolution of 1956, after which, he said: "I waited in hopes the party might improve. It didn't."