 In 1941, he returned to Farnborough as head of the newly formed Gas Turbine Division and in 1944 he was sent for a time to Washington to work with the British Air Commission.In 1945, he became Deputy Director of Engine Research in the British Ministry of Supply before returning to America a year later as an Associate Professor of Engineering at MIT.He was appointed George Westinghouse Professor of Mechanical Engineering there at the age of 35, and in 1951 returned to Cambridge, UK as the first Hopkinson and Imperial Chemical Industries Professor of Applied Thermodynamics (1951–1980).