Later in 1957, he went to Syracuse University as a postdoc to research quantum gravity - collaborating with Peter Bergmann, and remained at Syracuse as assistant professor and associate professor, until 1963 when he left to join the Physics Department at Yeshiva University in New York City.
:For the soap opera actor, see Peter Bergman; for the Firesign Theatre member, see Peter Bergman (comedian).
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In 1967, he went to United States to study General Relativity theory at Central Studies of Gravitation at Syracuse University under direction of Peter Bergmann and Joshua N. Goldberg whom were among authoritative experts in general relativity after the inventor, Albert Einstein.