As the pollster for Clinton in the
1992 United States presidential election, Greenberg was a major figure in the famed campaign "war room" (and subsequently the
documentary film of the same name). He was the CEO and principal owner of Democratic polling firm Greenberg Quinlan Rosner until 2016. After that, Greenberg was solely involved in Greenberg Research, where he is the CEO. Along with
James Carville and
Bob Shrum, he co-founded Democracy Corps, a non-profit organization that produces left-leaning political strategy. He was previously a partner 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 member of the
House of Representatives, Emanuel had lived rent-free for five years in a basement guest room in the Washington,bD.C. house owned by Greenberg and his wife,
Rosa DeLauro, herself also a Democratic member of the House. During this time, Emanuel served as chairman of the
Democratic Congressional Campaign Committee, which awarded large polling contracts to Greenberg's firm. Greenberg's former corporate clients include
BP,
British Airways,
Monsanto Company,
Boeing,
General Motors and
Microsoft. During his work for the Austrian
SPÖ in 2001, Greenberg was criticized by
FPÖ leader
Jörg Haider over allegations of
negative campaigning. Greenberg works as a political consultant to the Greek prime minister
Kyriakos Mitsotakis. ==Personal life==