Who is this guy? (I'm trying to relocate a lecturer on conspiracies)

I came across someone, giving a lecture, on youtube, about conspiracies. I watched a bit, thought it interesting, then deleted it, thinking that I would get back to it later. He was called Freeman, I think, and there were several other entries under ‘Freeman on…’(whatever it was). American or Canadian. Looks like a young Carlos Santana. Problem is, Freeman does not bring up the same guy or lecture on youtube. Do you know who I mean? Is he famous? Is he credible?
p.s His lecture was about ancient alien visitation to the Earth, and featured the book ‘The Sirius Mystery’ by Robert Temple.

Thanks in advance, great collective fluther mind.