Seymour Martin Lipset ( ; March 18, 1922 – December 31, 2006) was an American sociologist and political scientist (President of the American Political Science Association). His major work was in the fields of political sociology, trade union organization, social stratification, public opinion, and the sociology of intellectual life. He also wrote extensively about the conditions for democracy in comparative perspective. A socialist in his early life, Lipset later moved to the right, and was often considered a neoconservative. At his death in 2006, The Guardian called him "the leading theorist of democracy and American exceptionalism"; The New York Times said he was "a pre-eminent sociologist, political scientist and incisive theorist of American uniqueness"; and The Washington Post said he was "one of the most influential social scientists of the past half century." Early life and education Lipset was born in Harlem, New York City, the son of Russian Jewish immigrants. His family urged him to become a dentist. He grew up in the Bronx among Irish, Italian and Jewish youth. "I was in that atmosphere where there was a lot of political talk," Lipset recalled, "but you never heard of Democrats or Republicans; the question was communists, socialists, Trotskyists, or anarchists. It was all sorts of different left wing groups." From an early age, Seymour was active in the Young People's Socialist League, "an organization of young Trotskyists that he would later head." He graduated from City College of New York, where he was an anti-Stalinist leftist,. He received a PhD in sociology from Columbia University in 1949. Before that he taught at the University of Toronto. Academic career Lipset was the Caroline S.G. Munro Professor of Political Science and Sociology at Stanford University and a senior fellow at the Hoover Institution and then became the George D. Markham Professor of Government and Sociology at Harvard University. He also taught at Columbia University, the University of California, Berkeley, the University of Toronto, and George Mason University where he was the Hazel Professor of Public Policy. Lipset was a member of the American Academy of Arts and Sciences, the United States National Academy of Sciences, and the American Philosophical Society. He was the only person to have been President of both the American Political Science Association (1979–1980) and the American Sociological Association (1992–1993). He also served as the President of the International Society of Political Psychology, the Sociological Research Association,