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

More Answers from Past Speakers

George Soros

Philanthropist and Financier

George Soros | September 7, 2006 | Hobby Center | The Progressive Forum

Karen Armstrong

Religious Historian

Karen Armstrong | October 8, 2009 | Wortham Center | The Progressive Forum

Ken Robinson

Creativity Expert

Sir Ken Robinson | March 20, 2012 | Wortham Center | The Progressive Forum

Brian Greene

Theoretical Physicist

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

Edward O. Wilson

Biologist, Conservationist, Theorist

Edward O. Wilson | September 27, 2006 | Wortham Center | The Progressive Forum

T. Boone Pickens

Businessman, Energy Leader

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

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