John McCarthy on Elephant 2000, Lisp, Ruby and the Computer Industry (2008)

John McCarthy's videos are rare and it's great to see him talking. It's been said that LISP (alternatively J. McCarthy) borrowed the concept of functional closures from APL in mid 60's, that is McCarthy was not the original thinker of closures.

He has such a great command of the subject and of related disciplines like logic and philosophy. It's interesting that he really kind of kept to himself over the decades rather than speaking more.