Gov. Ed Rendell
Geoffrey Canada
Atul Gawande
Dr. Ronald DePinho
Fen Montaigne
Chris Hughes
Bernard-Henri Levy
Kevin Spacey
Sherry Turkle
Cornel West
Ron Reagan Jr.
Chris Matthews
Charlie Rose
Amy Chua
Michael Waldman, Christine Yvette Lewis
Dr. Daryl Bem, Brian Greene
Samer Shehata, Dr. Paul Offit
Leslie Dach, Michael Lewis
Sean Kelly
Jane McGonigal
LCD Soundsystem
Christiane Amanpour, David Albright
Eric Foner
Jeffrey Leonard
Eugene Jarecki
Randi Weingarten, Bing West
Stephanie Coontz
Glenn Greenwald, Mike Huckabee
Michael Scheuer
Evan Osnos
Harry Connick Jr.
Mark W. Moffett
Joshua Foer
Dan Sinker
David Brooks
Reza Aslan
Steve Martin and the Steep Canyon Rangers
Ayman Mohyeldin
Nathan Myhrvold
Jody Williams
Michael Moore
Dr. Anthony Fauci
Tim Shriver
Piers Gibbon
Andrew Chaikin
James Franco
Sir David Tang
Jeff Greenfield
Jamie Hyneman and Adam Savage
Ray Kurzweil
Morgan Spurlock
Caroline Kennedy
Ron Paul
A.C. Grayling
Ice-T
Wade Graham
Francis Fukuyama
Rex Ryan
Amy Farrell
Bill James
Lupe Fiasco
Geoffrey Rush
Eric Greitens
John Bradshaw
Alison Klayman
Amy Kremer
Austan Goolsbee
Kareem Abdul-Jabbar
James Stewart
Robert Kennedy, Jr.
Salman Khan
Werner Herzog
Sugar Ray Leonard
Bre Pettis
Tom Ridge
Henry Kissinger
Janny Scott
Keith Olbermann
Bon Iver
Florence And The Machine
Talib Kweli
The Black Belles
Grover Norquist
Alexandra Pelosi
Gary Sinise
Timothy Garton Ash
Michael Shermer
Dan Savage
David McCullough
Jose Antonio Vargas
John Prendergast
David Carr
Michael Sandel
David Eagleman
Brian Cox
Brooke Gladstone
Mary (Missy) Cummings
Buddy Roemer
Tony Hsieh
Al Hunt
Robert Wittman
Anthony Bourdain
Nassir Ghaemi
The Cars
Elliot Ackerman
Gloria Steinem
Ambassador Susan Rice
STS-135 astronauts
Jeff Bridges
Kevin Mitnick
Gov. Tim Pawlenty
Robin Wright
Tom Brokaw
Diane Sawyer
Al Gore
David Copperfield
Jeffrey Kluger
Daniel Yergin
Jeremy Ben-Ami
Radiohead
Melinda Gates
Ken Burns
Mark Cuban
