John Maurice Hardman Campbell OBE FRCP (1891–1973) was a British physician, cardiologist, and medical journal editor.
He was awarded a senior demyship at Magdalen College, Oxford and entered in 1914 Guy's Hospital Medical School, where he graduated in 1916 BM BCh (Oxon.).
Campbell held from 1923 to 1927 a Beit memorial research fellowship, in 1925 resumed clinical work as a medical registrar, and in 1926 became an assistant physician at Guy's Hospital.
[3] This led to an intense period of surgical development and close collaboration with Russell Brock and Charles Baker that would make Guy's Hospital famous for its surgery on congenital heart disease and mitral stenosis.
On 28 August 1924 in Nefyn, Caernarfonshire, Maurice Campbell married Ethel Mary Chrimes, a nurse at Guy's Hospital.