Greenberg has written several influential books, including Dispatches from the War Room: In the Trenches with Five Extraordinary Leaders, R.I.P. G.O.P., The Two Americas, and, with co-author James Carville, the NYT-best-selling It's the Middle Class, Stupid!.
Greenberg taught for a decade at Yale University where he received a Guggenheim Fellowship. He was educated at Miami University and Harvard University, where he received his Ph.D. In 1980 he founded Greenberg Quinlan Rosner Research, a Democratic-leaning polling and strategy firm. He served as a core member of Bill Clinton 1992 election campaign and continued to provide polls and analysis to Clinton through his first term. He also served as pollster and advisor to Al Gore’s 2000 presidential campaign.
In 1999 Greenberg and Carville founded Democracy Corps, a leading organization providing in-depth research and strategic advice to progressive groups, candidates, and leaders. In 2016, Greenberg founded Greenberg Research. Greenberg has worked collaboratively with distinguished Republican pollsters and conducts the bi-partisan polls for NPR, The Los Angeles Times and the Bipartisan Policy Center.
Greenberg was inducted into the American Association of Political Consultants' "Hall of Fame." His daughter, Anna Greenberg, taught polling and politics at Harvard University and has been partner at Greenberg Quinlan Rosner since 2001.