Ryan Reynolds

Producer, Screenwriter, Actor & Entrepreneur; Co-Owner of Welsh Football Club Wrexham A.F.C.

Rose Marcario

Former President and CEO of Patagonia; Partner at ReGen Ventures

Jason Momoa

Actor, Producer, Environmental Activist, Known For "Aquaman" and "Game Of Thrones"

Matt Damon

Actor, Screenwriter & Producer; Co-Founder of Water.org; Expert Advocate on Global Water & Sanitation Crisis

Jessica Alba

Actress; Entrepreneur; Founder & CEO of The Honest Company

Alanis Morissette

Alt-Rock Angst Icon Known for "You Oughta Know" & "Ironic"

will.i.am

Multi-Faceted Entertainer & Creative Innovator; Education Advocate

Black Eyed Peas Present Masters of the Sun: The Zombie Chronicles (Black Eyed Peas Pres...

Arnold Schwarzenegger

Actor, Producer, Director, Writer; California’s 38th Governor; Host of "Celebrity Apprentice"

Alexis Ohanian

Co-Founder of Initialized Capital & Co-Founder of Reddit; Entrepreneur, Investor, Activist & Bestselling Author

Alexis Ohanian Carthage College Commencement Address 2014

Sheryl Crow

Grammy Award-Winning Singer-Songwriter

Sir Richard Branson

Businessman & Founder of Virgin Group

Annie Lennox

Singer-Songwriter Known for "Sweet Dreams;" Political Activist & Humanitarian

George Soros

Chairman of Soros Fund Management LLC, Founder of Open Society Foundations & Philanthropist

James Cameron

Filmmaker, Artist, Environmentalist

Al Gore

45th Vice President of the United States, Nobel Peace Laureate & Bestselling Author

Bill Maher

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

Willie Nelson

Country Music Singer-Songwriter Known for "On The Road Again" & "Always On My Mind"

Cate Blanchett

Academy Award-Winning Actress Known for "Elizabeth" & "The Aviator;" Ambassador for the Australian Conservation Foundation

Olivia Munn

Television & Film Actress; Known for "Newsroom" & "X-Men: Apocalypse"

Olivia Munn on Jon Stewart | 2022 Mark Twain Prize

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist