Shelter Island Conference
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The first Shelter Island Conference on the Foundations of Quantum Mechanics was held from June 2–4, 1947 at the Ram's Head Inn in Shelter Island, New York. Shelter Island was the first major opportunity since Pearl Harbor and the Manhattan Project for the leaders of the American physics community to gather after the war. As Julian Schwinger would later recall, "It was the first time that people who had all this physics pent up in them for five years could talk to each other without somebody peering over their shoulders and saying, 'Is this cleared?' "
The conference, which cost $850, was followed by the Pocono Conference of 1948 and the Oldstone Conference of 1949. They were arranged with the assistance of J. Robert Oppenheimer and the National Academy of Sciences. Later Oppenheimer deemed Shelter Island the most successful scientific meeting he had ever attended; and as Richard Feynman recalled to Jagdish Mehra in April 1970: "There have been many conferences in the world since, but I've never felt any to be as important as this. .... The Shelter Island Conference was my first conference with the big men. .... I had never gone to one like this in peacetime." 
The conference was conceived by Duncan MacInnes, a scientist studying electrochemistry at the Rockefeller Institute for Medical Research. Once the president of the New York Academy of Sciences, MacInnes had already organized a number of small scientific conferences. However, he believed that the later conferences had suffered from a bloated attendance, and over this issue, he resigned from the Academy in January 1945. That fall, he approached the National Academy of Sciences (NAS) with the idea of a series of 2–3 day conferences limited to 20–25 people. Frank Jewett, the head of the NAS, liked the idea; he envisioned a "meeting at some quiet place where the men could live together intimately", possibly "at an inn somewhere", and suggested that MacInnes focus on a couple of pilot programs. MacInnes' first choice was "The Nature of Biopotentials", a subject close to his own heart; the second would be "The Postulates of Quantum Mechanics", which later became "Foundations of Quantum Mechanics".
Karl K. Darrow, a theoretical physicist at Bell Labs and secretary of the American Physical Society, offered his help in organizing the quantum mechanics conference. The two decided to try to emulate the success of the early Solvay Congresses, and they consulted with Léon Brillouin, who had some experience in that area. In turn, Brillouin suggested consulting Wolfgang Pauli, the recent Nobel medalist at the Institute for Advanced Study in Princeton.
In January 1946, MacInnes, Darrow, Brillouin, and Pauli met in New York and exchanged letters. Pauli was enthusiastic about the topic, but he was primarily interested in bringing together the international physics community after the ordeal of the war. He suggested a large conference, including many older, foreign physicists, much to MacInnes' chagrin. With Jewett's encouragement, MacInnes asked Pauli for suggestions of "younger men" such as John Archibald Wheeler, explaining that the Rockefeller Foundation would support only a small conference. Pauli and Wheeler replied that MacInnes' conference might be merged with Niels Bohr's conference on Wave Mechanics in Denmark in 1947; they pointed out that the Niels Bohr Institute had close ties with the Rockefeller Foundation anyway. Darrow wrote to Wheeler that Bohr's conference was a poor replacement because it would draw few Americans. Finally, Shelter Island was explicitly an American conference. Darrow was chairman of the conference.
Willis Lamb had found when probing hydrogen atoms with microwave beams that one of the two possible quantum states had slightly more energy than predicted by the Dirac theory; this became known as the Lamb shift. Lamb had discovered the shift a few weeks before (with Robert Retherford), so this was a major talking point at the conference. As it was known that the Dirac theory was incomplete, the small difference was an indication that quantum electrodynamics (QED) was progressing.
Electron magnetic moment
Another dramatic discovery was reported at the conference by Isidor Rabi; a precise measurement of the magnetic moment of the electron, though this was overshadowed by Lamb’s work.
The participants arrived Sunday evening, 1st-June-1947, and left Wednesday evening. They were:
- Metra, Jagdish (1994). The Beat of a Different Drum: The life and science of Richard Feynman. Oxford, England: Clarendon Press. pp. 245–249. ISBN 0-19-853948-7.
- Gribbin, John & Mary (1997). Richard Feynman: A Life in Science. England: Viking Press. p. 105. ISBN 0-670-87245-8.
- Primary sources
- Bethe, Hans (August 15, 1947). "The Electromagnetic Shift of Energy Levels". Physical Review. 72 (4): 339–341. Bibcode:1947PhRv...72..339B. doi:10.1103/PhysRev.72.339.
- Lamb and Retherford; Retherford, Robert (August 1, 1947). "Fine Structure of the Hydrogen Atom by a Microwave Method". Physical Review. 72 (3): 241–243. Bibcode:1947PhRv...72..241L. doi:10.1103/PhysRev.72.241.
- Marshak and Bethe; Bethe, H. (September 15, 1947). "On the Two-Meson Hypothesis". Physical Review. 72 (6): 506–509. Bibcode:1947PhRv...72..506M. doi:10.1103/PhysRev.72.506.
- Weisskopf, Victor (September 15, 1947). "On the Production Process of Mesons". Physical Review. 72 (6): 510. Bibcode:1947PhRv...72..510W. doi:10.1103/PhysRev.72.510.
- Robert Crease & Charles Mann (1996). The second creation: Makers of the revolution in twentieth-century physics. Rutgers University Press. ISBN 0-8135-2177-7.
- Schweber, Silvan (1985). "A Short History of Shelter Island I". In R. Jackiw; N. Khuri; S. Weinberg; E. Witten. Shelter Island II: Proceedings of the 1983 Shelter Island Conference on Quantum Field Theory and the Fundamental Problems of Physics. MIT Press. pp. 301–343. ISBN 0-262-10031-2.
- Schweber, Silvan (1986). "Feynman and the visualization of space-time processes". Reviews of Modern Physics. 58 (2): 449–508. Bibcode:1986RvMP...58..449S. doi:10.1103/RevModPhys.58.449.
- Schweber, Silvan (1994). QED and the Men Who Made It: Dyson, Feynman, Schwinger, and Tomonaga. Princeton University Press. ISBN 0-691-03685-3.