John Sirs was Professor of Biophysics at the University of London between 1979 and 1991. He read physics at Durham University, later moving to the Department of Colloid Science, Cambridge as research student supervised by FJW Roughton. After gaining his PhD, he became interested in the physiology of blood gas transport, research he continued after his appointment as Lecturer in Physics at St Mary’s Hospital Medical School (1960), under SG Rowlands. Over the next twenty years his research addressed the physical properties of erythrocytes, often in collaboration with clinicians. Having taught physics for some years, he later developed a statistics course for medical undergraduates, which he ran for two decades.

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