I heard both Shockley and Teller speak when I was a grad student. Both were pretty creepy. (Teller was still debating Bethe, though both were in their 80s.)
On the other hand, I used to share an office wall with Bob Dennard, the inventor of dynamic memory. (He was a couple of offices down on the other side.) Nice guy--ready to help anybody.
The guy who designed the first H-bomb used to work at Watson too--Dick Garwin. He was a grad student at Los Alamos in the '50s, and designed the first one by hand--Ivy Mike it was, I think
Cheers
Phil Hobbs