He later joined the Anglo-Canadian nuclear program (group of Montreal) in Canada where he joined other Frenchman such as Hans von Halban, Jules Gueron, Pierre Auger, and Lew Kowarski who would join the project in 1944.
He supervised the construction of Canada's first nuclear reactor (ZEEP) at the Chalk River Laboratories in 1945.
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Kowarski then worked in the Montreal Laboratory in Canada, but only after Halban had been replaced as Director by John Cockcroft, as he did not want to work under Halban.
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A staff member of CERN (Geneva) since participating in its formation in 1953, he was a Decorated Officer Legion of Honor, Fellow of the American Nuclear Society, and a recipient of citation and prize from the U.S. Atomic Energy Commission.
Lew Wallace | Lew Grade | Lew Ayres | Lew Tabackin | Lew Irwin | Lew Hoad | Lew Brown | Jack Lew | Lew Stone | Lew Pollack | Lew Christensen | Lew Burdette | Richard Beebe in the original line-up of '''Lew Irwin and The Credibility Gap''' (left to right): John Gilliland | Lew Perkins | LEW Hennigsdorf | Lew Hayman | Lew Dockstader | Lew Cody | Elizabeth Van Lew | River Lew | Peter Lew | Michael Lew | Lucky Lew | Lew Worsham | Lew Stringer | Lew Sapieha | Lew Rywin | Lew Lewis | Lew Leslie | Lew Lehr |