This interview includes information on Kenneth Bainbridge's pre-Harvard education and postdoctoral experience; pre- World War II work at Harvard with students and in building of the cyclotron; wartime work on radar in the U.S. and Britain; more to the Manhattan Project and responsibility for Trinity test site; return to Harvard and start of new cyclotron building. Session two describes Bainbridges return to Harvard after his time in Los Alamos. His first task was the construction of a new cyclotron. He also helped to get the Physics Department back into prominence, attracting and retaining (or not) colleagues who had been doing war work. Examples of the former are Purcell and Ramsey and of the latter, R. R. Wilson. Bainbridge describes his time as department chairman, setting up the Loeb Lectureship which persists to this day. A notable event of the 1950s is the ordeal of Wendell Furry, a colleague who was called before the House Committee on Un-American Activities. Harvard and Furrys colleagues stood by him but his life was unalterably changed.