Patrick Henry Dean was born in Berlin , Germany , to Henry Roy Dean , ( 1879 – 1961 ) , a professor of Pathology at the University of Cambridge , and his wife , Irene Wilson ( 1875 – 1959 ) , the daughter of Charles Arthur Wilson . Henry Roy Dean was a member of the MacCormac family and was the maternal grandson of Dr Henry MacCormac and the nephew of Sir William MacCormac . After education at Cambridge , he was called to the Bar by Lincoln 's Inn , and he attempted to secure a career at the Bar in London , but was unsuccessful , and as a result he joined the Civil Service . He became a legal adviser to the Foreign office . In that capacity , Dean served as a legal adviser at the Yalta Conference in February 1945 , dealing with the repatriation of prisoners , and at the Potsdam Conference , in July and August 1945 . He also served as an adviser during the postwar Nuremberg trials of German war criminals and to the British Control Commission in occupied Germany . As British ambassador to Washington , Dean was occupied with difficulties over Vietnam and British military commitments East of Suez . He helped to promote greater mutual understanding between the two governments , but faced a president who had a negative attitude to foreign diplomats
Yalta Conference
Yalta Conference
Patrick Dean