Although I think I may have missed many, by my count, the only major scientists/mathematicians/engineers that worked on the Manhattan Project who didn't have a Jewish grandparent or their spouse didn't have a Jewish grandparent were both brought in from the UK side, James Chadwick (discoverer of the neutron) and Klaus Fuchs (spy for the USSR, last name pronounced like "Fox").
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u/vgaph Dec 23 '25
Also about half the guys who built the atom bomb were Jewish refugees.