<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Indeed. Always interesting to see these guys outside the classroom, lab, lecture circuits, etc. They're normal guys with relatively normal lives. Someone you could sit down with, have a beer, and talk about the local sports team.I, certainly, wouldn't argue against him being the smartest since. Definitely, the most influential in his field. <br />Posted by derekmcd</DIV></p><p>I'm not sure who you mean by "these guys", but I guess that you are referring to top-ranked theoretical scientists and mathematicians. Some are pretty normal guys, and some are not. Some have gigantic egos, and some do not. I did not know Feynman directly, but I do know people who did know him and he was on the eccentric side. Eugene Wigner was also rather prominent, but he was also quite humble. When I was in school he would sometimes sit down at table in the student union with the students, and he was embarrassed when he was recognized. (Wigner was one of the three guys who wrote the letter that Einstein signed that was sent to Roosevelt to start the Manhattan project.) </p><p>A gentleman of my acquaintance (still living and very approachable but who will remain unidentified at this juncture) who served on panels with Edward Teller, tells me that Teller had the habit of going off on the most unlikely tangents and had to be reined in regularly and abruptly to keep him on track. </p><p>Rene Thom, who received the Fields Medal for his work in developing catastrophe theory gave the most opaque talk that I have ever attended -- completely unfathomable to everyone in attendance except the departmental secretary !! On the other hand John Milnor, also a Fields Medalist gave the most easily understood coloquim lecture of my experience.</p><p>Lou Auslander, a well-known mathematician was quite approachable, but often incomprehensible. I attended a talk of his at which he attributed some the work about which he was speaking to a student of his -- Richie T. About 15 minutes into the talk Richie, who was seated beside me, leaned over and whispered to me "What the hell is he talking about"?</p><p> So just as with other people, my experience is that "these guys" are quite diverse in personality and behavior. The one common denominator is that they work extremely hard at their profession, and tend to speak very precisely about topics in which they are expert.</p><p> </p> <div class="Discussion_UserSignature"> </div>