The Shelter Island Conference in the summer of 1947 was outstanding, it was unique. I have never before or after attended any conference which was so influential. It brought together a lot of the leading theoretical physicists of the United States. It included Oppenheimer and Weisskopf and me, and it also included Linus Pauling. It included younger people like Feynman and Pais. And I don't think I could name all the people. It also included a number of experimenters, for instance, Rabi, and a group around him. It included a very important foreign theorist, Kramers, who had thought a lot about electrodynamics, quantum electrodynamics, during the war. Kramers told us that we really had misunderstood the self energy of the electron. He told us that, after all, the free electron has a self energy interacting with its own electric field, and that self energy is included when we measure the mass of the electron. And therefore, that self energy, which a free electron has, is already included, one shouldn't include it once more by calculating it. So never mind that it gives an infinite answer, you just disregard the self energy of the free electron, you have to consider the difference in free energy between the free energy [electron] and, let's say, an electron bound in the hydrogen atom, and only the difference was what counted.