The Oldstone Conference of 11 to 14 April 1949 was the third of three postwar conferences held to discuss quantum physics; arranged for the National Academy of Sciences by J. Robert Oppenheimer, who was again chairman. It followed the Shelter Island Conference of 1947 and the Pocono Conference of 1948. There were 24 participants; new participants were Robert Christie, Freeman Dyson (whose writings explained Feynman’s ideas), George Placzek, and Hideki Yukawa.
Held at Oldston-on-the-Hudson in Peekskill, New York, the main talking-point was Richard Feynman’s approach to quantum electrodynamics (QED); Feynman was now (at 30) the leading physicist of his generation.
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Oldstone Conference Wikipedia(Text) CC BY-SA