A. N. Cockcroft

Sir John Douglas Cockcroft was a British physicist who, with Ernest Walton, pioneered the use of particle accelerators to split the atomic nucleus in 1932, earning the 1951 Nobel Prize in Physics. He led key wartime scientific efforts, including radar development and Canada's atomic energy project, and later directed the British Atomic Energy Research Establishment at Harwell. Cockcroft also served as the first Master of Churchill College, Cambridge, advancing nuclear power and accelerator science.[1][2][3]