Sir Brian Keith Follett FRS DL (born 22 February 1939) is a British biologist, academic administrator, and policy maker. His research focused upon how the environment, particularly the annual change in day-length (photoperiod), controls breeding in birds and mammals. Knighted in 1992, he won the Frink Medal (1993) and has been a Fellow of the Royal Society since 1984, and served as the Chair of the UK government's teacher training agency and Arts and Humanities Research Council, and was Vice-Chancellor of University of Warwick.