This professor is a fluent yet relaxed speaker who enlivens his lecture with dry humour coupled with the deadpan comic's lack of smile. Gestures are active but smooth; a laid back compliment to a litany of criticism which builds in strength and persuasiveness, rather than an enforcement of angry denunciations.
I couldn't discover the fellow's height, but relative to the objects on stage it is clear he is slim and at least somewhat tall. Note also that he is bald and wearing black framed spectacles. I venture that Scott Galloway is an NP type of moderately high temperament, although N is also possible.