We were saddened to hear of the death of Dr W. Alan Jennings last month. Dr Jennings developed conformal radiotherapy at the Royal Northern Hospital, London. He was a founder member of the Hospital Physicists’ Association and became its President (1966–7). He spent the second half of his career at the National Physical Laboratory, initially as Head of Radiation Dosimetry (1967–75) and later as Head of the Division of Radiation Science and Acoustics (1975–83). He was much involved in national and international work in the measurement of ionizing radiation. He is pictured (r) alongside Professor John Clifton (l) at our Wellcome Witness seminar 'Development of Physics Applied to Medicine in the UK, 1945-1990', both gentlemen having made memorable contributions to the meeting.

An obituary of Dr Jennings by his son, Michael, is available via the Guardian website: http://www.theguardian.com/science/2016/may/26/alan-jennings-obituary.