Callan was born in
Maidenhead in
Berkshire the son of Garnet George Callan, a naval architect, and Winifred Edith Brazier, a teacher. He was educated at King's College School in Wimbledon, and then won a place at St John's College at
Oxford University graduating with a First Class MA in Zoology in 1938. After initially finding employment at the
John Innes Institute in
Surrey, he won a scholarship and jumped at the chance of working at the
Stazione Zoologica in
Naples. This was initially to study sex hormones of the octopus. It was here that he first saw
Lampbrush chromosomes, which became his lifetime obsession. His studies in
Naples were interrupted by the
Second World War. Mick initially joined the
RAF, rising from Flight Lieutenant to Squadron Leader, as a highly competent airman. He was then transferred into
radar research and operation. After the war, then newly married, he moved to work at
University College, London, and from there to
Edinburgh to work under the famed biologist
Conrad Hal Waddington. Here he worked in the Research Unit of Animal Genetics from 1946 to 1950. In 1950, Callan gained a D.Sc. from the University of Edinburgh. He then received a professorship (the Kennedy Chair in Natural History) at
St Andrews University, replacing Prof
D'Arcy Wentworth Thompson, and stayed in this role from 1950 to 1982. He promoted scientific advancement within the Soviet Bloc, travelling three times to Russia and once to China, in the interests of scientific advancement. His final (post-retiral) research was spent largely with Dr
Joe Gall in
Baltimore, working on
snurposomes and RNA-packaging. He died at home, Feuchside near
Dundee, on 3 November 1993. ==Family==