Mayim Bialik

Neuroscientist, Host of Jeopardy!, Mental Health Advocate & Actress Known for "The Big Bang Theory"

Mayim Bialik on Why She Started Talking About Her Mental Health

Roland Martin

Award-Winning Journalist & Media Personality, Author of "Listening to the Spirit Within: 50 Perspectives on Faith"

Baratunde Thurston

Futurist Comedian, Writer & Cultural Critic

Dambisa Moyo

Global Economist, Author & Investor in the Future

Leslie Sanchez

Political Analyst & Entrepreneur

Norman Ornstein

Bestselling Author, Political Analyst & Resident Scholar at the American Enterprise Institute

Kevin Powell

Writer, Humanitarian, President of BK Nation

Bill Maher

Political Satirist & Host of HBO's "Real Time"

John Kasich

Former Governor of Ohio

Garry Kasparov

World Champion Chess Expert & Strategist; Chairman of the Human Rights Foundation based in New York

John Stossel

Emmy-Award Winning Journalist

George Mitchell

Global Diplomat, Peace Negotiator & Leadership Expert; Former Senate Majority Leader Who Enjoyed Bipartisan Respect

Marcus Luttrell

Decorated Navy SEAL & Bestselling Author of "Lone Survivor"

Morton Kondracke

Political Commentator & Columnist

John Oliver

Emmy-Winning Comedian, Best Known for "The Daily Show with Jon Stewart" & "Last Week Tonight"

Michael Barone

Senior Political Analyst, Washington Examiner

Antonio Villaraigosa

41st Mayor of Los Angeles

Nikil Saval

Pennsylvania State Senator; Author of "Cubed: A Secret History of the Workplace"

Nikil Saval Launch Speech

Lawrence O'Donnell

Political Analyst, Author & Host of "The Last Word with Lawrence O'Donnell"