Was fortunate to meet and spend some time with Andrew (Bunnie) a couple years ago.
The guy is just a stellar nice person. Generally speaking he's usually the smartest guy in the room yet he's totally approachable and down-to-earth.
One of his gifts is a Feynman-like ability to explain complex topics in a down-to-earth manner.
If you get a chance to hear him speak/present, take it.