Right? His speech is really good. Not a lot of engineer (or people, as the matter of fact) can give a speech that fluently.
Recent examples:
2h50 2013 QuakeCon keynote https://www.youtube.com/watch?v=Uooh0Y9fC_M
2h20 2014 SMU talk https://www.youtube.com/watch?v=3_oTvUl88hs
1h30 2014 Oculus Connect keynote https://www.youtube.com/watch?v=nqzpAbK9qFk