Born at South Woodford, Essex, on 26 February 1878, the elder son of James Greenfield, sugar broker, and Rachel Weston, his wife. He was educated at Ash House School, Banbury, and at Guy's Hospital. At Guy's he served as house physician, house surgeon, and clinical assistant, and edited the Gazette. Before qualifying he served in the South African War and was attached to the Imperial Yeomanry Hospital at Deelfontein. He went into partnership with F D Crew, MRCS at Higham Ferrers, Northamptonshire, but later set up on his own in the town of Rushden in the same county. During the war of 1914-18 he served with the RAMC in France. Greenfield was a man of great energy, who not only had the leading practice at Rushden but was a very prominent citizen. He served on the Council of the British Medical Association 1926-27 on its Insurance Acts Committee and Medical Planning Commission. Locally he was chairman of the Northampton division of the BMA 1931-32, and president of the Northants branch 1932-33. His most successful achievement was the organization of regular collections throughout the county for the Northants Medical Charity. He was churchwarden and choir-master for many years at Rush Parish Church, and served on the Urban District Council. He painted in water-colours, and was a collector of furniture; he built his own house, and was a skilled gardener. His hospitality was wide, his tennis parties being particularly popular. He retired in 1946. Greenfield married twice: (1) in 1907 May Ormonde, who died in 1947; their son had died of cancer in 1938 while a student at Guy's; (2) in December 1948 Isabel Agnes (Meldrum), widow of the Rev John Beck, who survived him. Dudley Greenfield died on 11 January 1950 at 2 Griffith Street, Rushden aged 71, after six months' illness.