My grandfather also worked on it, as a technician in Los Alamos.

He had previously been working for a scientific supplies company in Chicago that was (unbeknownst to him) providing supplies to the Manhattan Project. Apparently his boss was aware of it, and when my grandfather's draft was called a letter from his boss convinced the draft board to assign him to Los Alamos instead. He was eventually able to get my grandmother, a secretary and typist, a job as a secretary in Los Alamos as well so that she could join him. She teased him the rest of their lives, because as the secretary to someone more important than a lowly technician, she had technically had a higher security clearance than he ever did!

The Atomic Heritage Foundation collects records about people who were affiliated with the Manhattan Project, as well as oral histories. Perhaps they have more information about your grandfather's work? See here: https://ahf.nuclearmuseum.org/ahf/bios/

Thank you for the link. I tried using their little search table, but nothing returned. One thing that makes matters a bit more difficult was record keeping at the time. My family has some other documents from his life where he apparently went by a few different permutations of his name. That, or mistakes were made when entering records.

I might trying contacting them directly though. Thanks again!