Stephen William Hawking CH CBE FRS FRSA was an English theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge at the time of his death. How much is Stephen Hawking Worth? Stephen Hawking net worth: Stephen Hawking was an English theoretical physicist, cosmologist, and author who had a net worth of $20 million at the time of his death. Hawking was born on 8 January 1942 and grew up in St Albans, the eldest of four siblings. His father was a research biologist and his mother a medical research secretary, so it was not surprising that he was interested in science.