I didn’t know what was his name, but I knew him very well from the various popular science movies that he’s been in

he’s an American theoretical physicist, a very interesting character, explains things in a simple language

now he’s a professor in theoretical physics at  City College of New York, hosts two radio programs, writes books and of course, does movies

you can see some of his work at YouTube (just click the link)

anyway, I think I should mention him because he deserves it

here’s his Wikipedia page