Mustafa earned his M.D. from the Lebanese University, Beirut, Lebanon, in 2024. At Dana-Farber Cancer Institute, he is mentored by Dr. Toni Choueiri and Dr. Alexander (Sasha) Gusev. His current research focuses on exploring the mechanistic pathways and associations in immunotherapy–related toxicities. His hobbies include exploring street food, playing backgammon, soccer, and board games.