Given his advanced scientific knowledge, Emmett likely follows the groundbreaking discoveries in nuclear fission closely. This may have included theoretical work on nuclear chain reactions and potential energy applications.

It's plausible that Emmett is recruited to contribute his expertise to the Manhattan Project during World War II. His contributions might include calculations, design work, or experimentation related to the development of the atomic bomb. Due to the secrecy surrounding the project, concrete details are unavailable. This could also explain why Doc is seen to have access to classified information and technology later in his life.

Following the use of atomic weapons in World War II, Emmett likely grapples with the ethical implications of his involvement in nuclear research. This could fuel his later pacifistic ideals and his focus on technologies with peaceful applications.