 After receiving his master's degree, Vincitorio taught history in New York City high schools before being hired to teach history and social sciences at Pace College from 1946-1948.He then joined the History faculty at St. John's University in 1948, where he taught for forty years and achieved the rank of Full Professor in 1957.After publishing two articles on Edmund Burke in 1953 and 1957, Vincitorio then collaborated with his mentor, Ross J. S. Hoffman, and Morrison V. Swift on a textbook, "Man and His History