G. Robert Gunther-Mohr joined the Manhattan Project in 1944. Mohr worked on the top secret polonium trigger being developed for the plutonium bomb at the Monsanto Chemical Company in Dayton, Ohio.
After the war, Mohr joined IBM, where he worked on semiconducters. He later became manager of applied physics and engineering at the Watson Research Lab in Yorktown, NY and eventually joined the Components Division, where he became assistant to the president.