Dr. Isaac Hammond was the chief research scientist of the ATLAS program.
Hammond was devoted to the research of ATLAS program. Despite making progress in his research, the Pentagon decided to shut down the project. When the project's Army advisor James Oberlin informed Hammond, he flew into a rage before being restrained by Military Police until he finally calmed down and promptly walked out of the ATLAS Observatory.
Five months after the ATLAS program was shut down and the bombs fell, Hammond returned to the observatory and attempted to finish the project, as he believed it would help the post-apocalyptic world. He reactivated the facility's security robots to aid in his work. Hammond did not survive to finish his work and may have died from exhaustion according to the holodisk left near his skeleton.
Isaac Hammond is mentioned only in Fallout 76.