He was born on 1 January 1903 son of Harry Evans, conductor of the celebrated choir at Dowlais and Merthyr Tydfil. His grandfather was a pharmacist at Dowlais and inspired him to take up the study of medicine. His parents moved to Liverpool and he was educated at Liverpool College, City of London School and the London Hospital, where he was a scholar and gained the K E D Payne scholarship in pathology in 1928. In 1929 he was appointed as assistant in the medical unit, and he became consulting physician to the London Hospital, the Poplar Hospital, King Edward VII Hospital for Officers, King Edward VII Sanatorium, Midhurst, and the Royal Masonic Hospital. He became best known as physician, in succession to Lord Dawson of Penn, in turn to Queen Mary 1944-53, to King George VI 1949-53, and to HM Queen Elizabeth II in 1953. He was also consulting physician to the Royal Navy, a member of the RAF Medical Advisory Board, and consultant to the London Transport Executive. He acted as an examiner in medicine for the Conjoint Board and for the University of London. At the College he was a Hunterian Professor, and at the College of Physicians was Croonian lecturer in 1955. He served as President of the Medical Society of London, and was a Knight in the Order of St John of Jerusalem. An able clinician of great personal charm, he found time to attend to the care of the most humble of his patients and was punctilious in his obligations to the London Hospital in particular the care of the nursing staff. In 1929 he married Helen Aldwyth, daughter of T J Davies, by whom he had two daughters; Lady Evans died on 3 December 1963. Lord Evans died on 26 October 1963 in King Edward VII Hospital for Officers.