Later emigrating to the United States, Lewin became Professor of Electrical and Computer Engineering at the University of Colorado Boulder.
Educated at Southend High School for Boys, and studying "mathematics with particular reference to transcendental functions and the electromagnetic theory of radiation,"[4] he first found employment in 1937 with the Marconi Wireless Telegraph Company.
[1][2][3] In 1941 he became a radio instructor and from then until the end of World War II he served with the Admiralty Signal Establishment (ASE) as a Temporary Experimental Officer, researching radar, radio antenna and mirror design,[1][2][3][4] and in 1945 he served as chairman of the Inter-Service Committee on Radar Camouflage.
[1][2][3][5] Lewin also wrote, co-wrote, or edited nearly 200 technical publications, including more than 10 research books on waveguides, mathematics and telecommunications.
[7] On his retirement from the University of Colorado in 1986, Lewin was made Professor Emeritus and continued to lecture for several years after that time.