Stanford Professor Robert Sapolsky
This is my favorite lecture on depression. Sapolsky is an outstanding lecturer. There is a whole series on the Standford youtube channel of Sapolsky lecturing on Human Behavioral Biology (the above lecture is a segment of that series). I think it is probably one of the most important lecture series out there, regardless of what one’s field of interest is. It is entertaining and informative, plus gives an excellent point of view for understanding yourself and others.