David W. Dewhirst (1926-2012) was an astronomer and librarian at the Cambridge Observatories and the Institute of Astronomy from 1950 to retirement in 1993. He was also a Gresham Professor of Astronomy and Chairman of the RAS Library for many years. He died on Sunday 23 September 2012. He remained interested in the IoA Library and the history of astronomy. He was also a benefactor to the Society of the History of Astronomy. He will be very much missed. There will be a funeral service for him at Corpus Christi Chapel, Cambridge on Monday 8th October at 2.30pm.