Peter Christopher Caldwell, FRS, (25 January 1927 – 1 June 1979) was a professor of Zoology at the University of Bristol.
[citation needed] Following his undergraduate studies, Peter Caldwell worked with Professor Cyril Hinshelwood, completing his PhD on the influences on the growth rate of bacteria, which led to important ideas about the ways in which cells synthesized proteins.
In 1950 he moved to University College London to work with the Nobel prize winning Archibald Hill, where he developed new methods for measuring pH.
While there, his work included the introduction of EGTA as a tool to study the regulation of Ca2+ inside cells, using it to make the first accurate measurements of the very low free Ca2+ concentration in muscle.
[citation needed] In addition to his direct scientific contributions, his PhD students have gone on to be influential scientists in medical research, including Professors Alison Brading and Clive Ellory (Oxford).