During World War II, Koyré lived in New York City, and taught at the New School for Social Research. After World War II, he was a frequent visitor to the United States, spending half a year at the Institute for Advanced Study at Princeton each year from 1955 to 1962 and also teaching as a visiting professor at Harvard, Yale, the University of Chicago, the University of Wisconsin, and Johns Hopkins. His lectures at Johns Hopkins would form the nucleus of one of his best known publications, "From the Closed World to the Infinite Universe" (1957). Koyré was general secretary and Vice President of the Institut International de Philosophie, a member of the American Academy of Arts and Sciences, a recipient of the George Sarton Medal of the History of Science Society, and of the Silver Medal of the Centre National de la Recherche Scientifique.