Gregory Adler was a brilliant robotics scientist from General Atomics International, who was contracted by the United States government to work on the Robobrain project at RB-2851. She was expected to work alongside Anna Karim, his long-time rival, with the expectation that the rivalry would reduce in increased creativity due to competition. Both he and Karim worked off-site, but their research teams assigned to RB-2851 more than made up for their absence, especially once test-subjects started arriving on the scene. Notably, Adler was very sensitive about unnanouced changes to the staff, particularly the addition of Kara Asante to the project.
Gregory Adler is mentioned only in Fallout 4.