[3] He joined Marconi's in 1930, to work on optical systems for television; after five years on the task and the award of his PhD, he switched to klystrons and UHF and centimetre waves.
At the outbreak of World War II, Levin was recruited into military research and made a "significant contribution" to the development of radar, at the H H Wills Physics Laboratory at the University of Bristol.
Two years later, Levin led a project to establish VHF systems along the south coast of England to support the D-Day landings and the subsequent campaign.
He was appointed Superintendent of the Admiralty Gunnery Establishment in 1951 and while he was in this post, sea-borne control systems for the Sea Slug missile were successfully developed and implemented.
[3] The offer, in 1958, of the post of Deputy Director at the Atomic Weapons Research Establishment at Aldermaston, posed a difficult choice for Levin but nuclear physics was another new field for him and the novelty attracted him.