Ion Trewin chaired the judging panel in 1974, and became a member of the Booker (now Man Booker) Prize Advisory Committee In 1989. He succeeded the late Martyn Goff as Administrator of the Booker Prize Foundation in 2006. This role became the Literary Director of the Booker Prize Foundation, a role he held until his death in April 2015. He also organises the annual 'Cheltenham Booker Prize' at the Cheltenham Literature Festival, which he chaired 1996-2007.
As a publisher, he was editorial director at Hodder & Stoughton before joining Weidenfeld & Nicolson, where he was successively Publishing Director, Managing Director and Editor-in-Chief until his retirement in 2006. He edited the Alan Clark Diaries (three volumes) and prize-winning authors, among them Richard Holmes, Andrew Roberts, Simon Sebag Montefiore, Antony Beevor and Edna O'Brien as well as Thomas Keneally's all time best-selling Booker Prize winner, Schindler's Ark. His other authors include Michael Palin (for his diaries), Julian Fellowes (for his novels Snobs and Past Imperfect), Julie Andrews (for her memoirs), all Sunday Times bestsellers.
As a journalist, he worked on the Sunday Telegraph, edited Drama Magazine and was London editor of the American Publishers Weekly. He was Literary Editor of The Times from 1972-79.
His own books include Alan Clark: the Biography, published to acclaim in 2009, and the prize-winning Hugo Young Papers: thirty years of British politics – off the record (2008) which was the Channel Four Political Book of the Year. He lived in Norfolk with his wife Sue; they have a son - the literary agent, Simon Trewin - and a daughter.
Ion Trewin died on 8 April 2015.