In the spring of 1957, the Weinbergs moved to New York for his job at Columbia University, where important experimental work had taken place throught the 1950s. He writes some (largely unimportant) papers on symmetry principles and weak interactions. His first encounter with Murray Gell-Mann gets off to a rocky start. Weinberg starts building a network of colleagues and friends. He misses the chance of tenure at Columbia, so rather than stay for another year as a postdoc, he decides to take up a research position at Berkeley. Before he leaves, he submits his paper on renormalization and infinities.