Life and career
Jewell was educated at Blundell's School and St John's College, Oxford, where he studied chemistry and met his future wife, Katharine. He then took up his first teaching post as science master at Winchester College. After a brief period working in a state school in Bristol, he returned to the independent sector at the age of 36 as headmaster of Bristol Cathedral School, which he led from direct-grant status to independence.
Later, he became headmaster of Repton School, a boys' school in England, and was subsequently headmaster of Haileybury and Imperial Service College. He presided over significant changes in both these schools. In 1990 he served as chairman of the Headmasters' and Headmistresses' Conference and as a councillor on Porthleven town council.