The person I got closest to was... Herbert Jehle,... He was originally German, a Quaker, who was trained by Schrödinger and obtained his Phd in the early 30s in Berlin. He knew Einstein very well and was very much interested in general relativity. Under his aegis I got interested in general relativity, I actually wrote a Master's Thesis on variational principles in general relativity. He suggested that I transfer to Princeton, which I did in '49.... he taught during the war at Harvard, and then moved to the University of Pennsylvania. He did lots of interesting things. He knew many people at the Institute of Advanced Study at Princeton, Einstein, Weyl, and many of the younger people in physics there, in particular Finkelstein and Wouthuyzen. He also worked with Pauling on molecular mechanisms of identification in biology.