I had him as a lecturer in undergrad, and I still remember the weightlessness of his intellect. It was one thing to realize that we were the same age, but his ability to flit around different concepts was remarkable.
There were a lot of people around who felt like high performance athletes of the mind, while he was just this sort of effortless butterfly going from flower to flower.
It looks like there's a more recent series as well: https://www.youtube.com/watch?v=r4-cftqTcdI