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

More Answers from Past Speakers

Larry Wilmore

The Daily Show "Senior Black Correspondent"

Larry Wilmore | February 25, 2009 | Wortham Center | The Progressive Forum

T. Boone Pickens

Businessman, Energy Leader

T. Boone Pickens | March 29, 2009 | Wortham Center | The Progressive Forum

Richard Dawkins

Evolutionary Biologist

Richard Dawkins | October 5, 2010 | Wortham Center | The Progressive Forum

Brian Greene

Theoretical Physicist

Brian Greene | September 29, 2009 | Wortham Center | The Progressive Forum

Michael Pollan

Journalist

Michael Pollan | October 27, 2011 | Wortham Center | The Progressive Forum

Arianna Huffington

Founder, The Huffington Post

Arianna Huffington | September 15, 2010 | Wortham Center | The Progressive Forum