From 1926 to 1935 he studied at the University of Paris-Sorbonne in Prof. Marcel Guichard's laboratory, earning a doctorate in physical sciences for which he was awarded the Adrian prize of the French Society of Chemistry.

[5] Responding to the historic call for resistance of General Charles de Gaulle, Guéron made his way to Great Britain in June 1940.

[6] In 1943 Guéron moved to Montreal as a member of the Tube Alloys team, which at this point also included the French scientists Hans Halban, Pierre Auger, Bertrand Goldschmidt, and Lew Kowarski.

Most notable was a lengthy interruption of the collaboration with the (American) Manhattan project which lasted until the August 1943 Quebec agreement between Winston Churchill and Franklin D. Roosevelt.

Some were highly critical of de Gaulle's constant opposition to the United States, and they imagined that he might reconsider if made aware of this specific and significant instance of America's awesome strength.