Shit! That video is Robert Sapolsky's lecture. I have something like an "intellectual" crush on him. He has done pioneering works in behavioural science, and at the intersection of human physiology and psychology. One of his books "Why Zebra's Don't Get Ulcers" is entirely on the various effects of psychological stress on the human body.

He observed the same group of baboons for 25 years to understand their behaviour. Each year he used to spend 4 months with this group and observe them for more than 8 hours a day. "A Primate's Memoir" is another book on this. Recently he wrote "Behave", on the deterministic nature of human behaviour, tracing "aggression" back to the evolutionary reasons.