Simon Sinek

World-Renowned Leadership Expert & Best-Selling Author

John Legend

EGOT Winning Musician, Producer & Philantropist

Mika Brzezinski

Co-host of MSNBC's "Morning Joe" & Bestselling Author; Founder of "Know Your Value"

Steve Wozniak

Co-Founder of Apple Computer, Inc.

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation

Joe Scarborough

Co-Host of MSNBC's "Morning Joe" & Former U.S. Congressman

Ashley Judd

Actress, Activist & Humanitarian

Peter Thiel

Former CEO and Co-founder of PayPal; Technology Entrepreneur, Investor and Philanthropist

Mitt Romney

Former Governor of Massachusetts, 2012 Republican Presidential Nominee and CEO

Andie MacDowell

Film Actress

Robert Reich

Economic Analyst, CNBC Contributor, Professor, Author, Advisor to Presidents & Former Secretary of Labor

Geoffrey Moore

Organizational Theorist, Management Consultant & Author

Aasif Mandvi

Comedic Actor & Former Correspondent for "The Daily Show"

Amory Lovins

Co-Founder & Chairman Emeritus of Rocky Mountain Institute

Lisa Ling

Award-Winning Journalist & Producer for CBS News

Ray Kurzweil

Chairman of Kurzweil Technologies, Inventor & Futurist; Author of "How to Create a Mind"

Dr. Michio Kaku

World-Renowned Futurist & Theoretical Physicist

Janet Mock

Author, Feminist, Transgender Rights Activist, TV Host & Founder of #GirlsLikeUs

Cass Sunstein

Director of the Behavioral Economics & Public Policy Program at Harvard Law School, NYT Best-Selling Author, Former Administrator of the White House Office of Information & Regulatory Affairs

Too Much Information with Cass R. Sunstein, JD

Kal Penn

Actor, Writer, Producer & Former Associate Director of the White House Office of Public Engagement