If you liked his talk, definitely check out his QuakeCon keynotes and his talk about physically based lighting.
https://www.youtube.com/watch?v=wt-iVFxgFWk https://www.youtube.com/watch?v=Uooh0Y9fC_M https://www.youtube.com/watch?v=IyUgHPs86XM
https://www.youtube.com/watch?v=wt-iVFxgFWk https://www.youtube.com/watch?v=Uooh0Y9fC_M https://www.youtube.com/watch?v=IyUgHPs86XM