Well, he teaches gifted education at the Hunter College of education. But this is what I found:

http://www.sciencedaily.com/releases/2001/11/011105073104.htm

Which disagrees with what he said. In fact, he mentioned twins separated and having different IQ scores. But the article I posted says differently.

So I said what he told me, I questioned the findings myself and I looked it up.

Ren