Alan Greenspan March 20, 2008
Jimmy Wales March 20, 2008
George Soros October 23, 2008
Ben Bernanke July 16, 2009
Peter Orszag February 11, 2010
Michael Lewis June 10, 2010
Nouriel Roubini September 30, 2010
Paul Volcker December 9, 2010
Sergey Brin and Larry Page August 18, 2011
Tony Hayward September 29, 2011
