From 1974 to 1980 he chaired the History Department at RIT. In 1976, Dr. Nazzaro organized and directed the International Symposium on Costantino Brumidi for the Bicentennial Celebration of the United States of America, and in 1977 he chaired a section of the international conference, “Italian Immigrant Women in North America” in Toronto, Canada.
Dr. Nazzaro has published over 40 scholarly essays in national and international journals, including Storia Contemporanea and Affari Sociali Internazionali, directed by the late Renzo De Felice, internationally acclaimed authority on Fascism. Also, Dr. Nazzaro has published in The Journal of European Economic History; the Rivista di Studi Politici Internazionali; Labor History; Encyclopedia International Grolier; Dictionary of American Immigration History; Great Lives From History, Twentieth Century Series; Research Guide to American Historical Biography; Research Guide to European Historical Biography; and The United States in the First World War: An Encyclopedia. Dr. Nazzaro contributed to the book Modernismo, Fascismo, Comunismo, Aspetti e Figure della Cultura e della Politica dei Cattolici nel ‘900; and to Studies in Italian American Social History and Gli Italiani negli Stati Uniti.