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, Tony Blair as Prime Minister of the United Kingdom, and Isaac Herzog as President of Israel. 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. Source: Wikipedia (en)