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Farewell retrospective of past speakers, closing night. 5:41 | More videos from Bill McKibben »

More Answers from Past Speakers

John Paul Stevens

Retired Supreme Court Justice

John Paul Stevens | November 16, 2010 | Wortham Center | The Progressive Forum

Richard Leakey

Paleoanthropologist, Conservationist, Statesman

Richard Leakey | October 28, 2010 | Wortham Center | The Progressive Forum

Michelle Alexander

Civil Rights Advocate, Legal Scholar

Michelle Alexander | October 2, 2012 | Wortham Center | The Progressive Forum

Nancy Pelosi

Speaker of the U. S. House of Representatives

Nancy Pelosi | June 12, 2009 | Wortham Center | The Progressive Forum

Sylvia Earle

Oceanographer

Sylvia Earle | April 5, 2011 | Wortham Center, Houston | The Progressive Forum

Gail Collins

New York Times Columnist

Gail Collins | June 26, 2012 | Wortham Center | The Progressive Forum