Chris Matthews

Former Host, Hardball with Chris Matthews, MSNBC

Demetri Martin

Comedian & Actor Known for Netflix's "The Overthinker;" Former Contributor on "The Daily Show"

Joshua Malina

Actor Known for his roles in "The West Wing" & "Scandal"

Michael Patrick MacDonald

Best-Selling Author

Nancy Lublin

Founder & Former CEO of Crisis Text Line

Kimberley Locke

Singer / Television Personality

John Lithgow

Actor, Musician, Author, Arts Advocate

Mara Liasson

National Political Correspondent for NPR

Tonya Lewis Lee

Author, Producer, Filmmaker & Entrepreneur; Women's Health Activist

Tonya Lewis Lee on the Black maternal mortality crisis

Steve Largent

Retired American Football Player & Former Member of the United States Congress

Jon Landau

Academy Award-Winning Producer of Titanic & Avatar

Lynne Lancaster

Co-founder of BridgeWorks; Generational Expert & Co-Author of "When Generations Collide"

Ricki Lake

Actress, Producer, Author Host, The Ricki Lake Show

Talib Kweli

Rapper, Emcee, Activist & Entrepreneur

Ellen Kullman

CEO of Carbon, Former Chair & CEO of DuPont & Former Director of General Motors

Bernard Kouchner

Former Minister of Health of France; Founder of Nobel Peace Prize-Winning Médecins Sans Frontières

Dean Karnazes

The “Ultramarathon Man”, Ran 3,000 Miles Across the Country with Live! with Regis and Kelly’s “Run Across America” in 2011

Dusty Baker

Former MLB Outfielder; Manager of the Houston Astros

Denise Austin

Fitness Expert, Author & Video Hall of Famer

John Amaechi

Organizational Psychologist, Leadership Transformation Expert & Former NBA Player