David Anthony Llewellyn Owen, Baron Owen, CH, PC, FRCP (born 2 July 1938) is a British politician and physician who served as Secretary of State for Foreign and Commonwealth Affairs as a Labour Party MP under James Callaghan from 1977 to 1979.. Owen served as British Foreign Secretary from 1977 to 1979, at the age of 38 the youngest person in over forty years to hold the post..