"British biochemist" . "Kenneth Callow"@en . . "Callow, Kenneth"@en . "1901Z"^^ . . "1901-02-15Z"^^ . . "1983Z"^^ . "Robert Kenneth Callow, FRS (15 February 1901 \u2013 1983) was a British biochemist. He worked at the National Institute for Medical Research (NIMR, Medical Research Council) in Hampstead and Mill Hill, where his work on steroids included contributions to the isolation and characterization of vitamin D, and the synthesis of cortisone from naturally occurring steroids."@en .