I have a PhD in particle physics (and work in the field). So more than a layman's familiarity with quantum mechanics/field theory. I have no idea who this guy i

I have a PhD in particle physics (and work in the field). So more than a layman's familiarity with quantum mechanics/field theory. I have no idea who this guy is; I know the name and for some reason I know he looks like a white-haired composer (I guess that's a publicist doing their job well) but other than that I literally have no clue. Is he a professor somewhere? Similarly, I know the name Brian Greene; my grandma bought me one of his books when I was in highschool, which I never read. On the other hand, I know very well who Penrose and Susskind are, familiar with their research, have met them both at normal academic events. So, n=1 but take what you will from that information...