Stanley Bernard Greenberg (born May 10, 1945) is an American pollster and political strategist affiliated with the Democratic Party. Greenberg is a founding partner of Greenberg Quinlan Rosner Research (GQR) and Democracy Corps, political consulting and research firms headquartered in Washington, D.C. Described as a "pollster supremo", Greenberg is known to have played a crucial role in the elections of Bill Clinton as President of the United States and Tony Blair as Prime Minister of the United Kingdom. As an anti-racist activist, Greenberg has written extensively about race relations in South Africa, and assisted Nelson Mandela's successful campaign in the 1994 South African general election. Early life and career Greenberg grew up in a Jewish family in Washington, D.C. In an article for Pacific Standard titled "Why Are You So Smart, Stan Greenberg?", Greenberg explained that a high school course called "American Civilization" partially inspired him to seek a career in politics. A political scientist who received his bachelor's degree from Miami University and his Ph.D. from Harvard, Greenberg spent a decade teaching at Yale University before becoming a political consultant. Greenberg's 1985 study of Reagan Democrats in Macomb County, Michigan, became a classic of progressive political strategy and the basis for his continuing argument that Democrats must actively work to present themselves as populists advocating the expansion of opportunity for the middle class. Political consulting career As the pollster for Clinton in 1992, Greenberg was a major figure in the famed campaign "war room" (and hence the documentary film of the same name). He was the CEO and principal owner of Greenberg Quinlan Rosner until 2016. After that, Greenberg was solely involved in Greenberg Research, where he is the CEO. He is co-founder (with James Carville and Bob Shrum) of Democracy Corps, a non-profit organization that produces left-leaning political strategy. He previously worked at Greenberg Carville Shrum, a political campaign consultancy firm. Greenberg is a noted advocate of progressive economic policies, and collaborated with left-wing think tank Economic Policy Institute (EPI) on a seminar titled "It's The Middle Class, Stupid!". In May 2010 Greenberg was linked to a controversy involving White House Chief of Staff Rahm Emanuel. As a House member, Emanuel had lived rent-free for five years in a basement guest room in the DC house owned by Greenberg and his wife, Democratic House member Rosa DeLauro of Connecticut. During this time, Emanuel served as chairman of the