While working in the Propulsion division, Jenowski and Rand spent three months working to complete thrust calculations for the XMB booster engine, much to the irritation of their supervisor. In Timeline#2077, they were both drafted by the US military. In the weeks leading up to his leaving for training, Jenowski slacked on office protocols, such as improperly recording logs, due to having to leave soon anyway. He was willing to take his work more seriously for Rand's sake, however.
Jenowski is mentioned only in Fallout 4.