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.
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New participants were Niels Bohr, Aage Bohr, Paul Dirac, Walter Heitler, Eugene Wigner and Gregor Wentzel; while Kramers, MacInnes, Nordsieck, Pauling and Van Vleck who were at the Shelter Island Conference were absent.