“He’s obviously skilled at all those different functions, but certainly what really drives him and where his passion really is, is his role as CTO,” or chief technology officer, Reisman said. “Basically his role as chief designer and chief engineer. That’s the part of the job that really plays to his strengths."
From that Reddit thread: https://www.reddit.com/r/SpaceXLounge/comments/k1e0ta/eviden...