Santo Jeger was born on 20th May 1898. Educated at University College, Cardiff, he became a doctor at St. Mary's Hospital. He joined the Labour Party and was mayor of Shoreditch and a member of the London County Council (1931-46). He was also a founder member of the Socialist Medical Association.
In the 1945 General Election Jeger was elected to represent South East St. Pancras in the House of Commons. Elected to Holborn and St. Pancras in February 1950 he held the seat until his death on 24th September 1953.