Ellen DeGeneres

Award-Winning Comedian, TV Host, Actress & LGBTQ Activist

Bill Maher

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

Olivia Munn

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

Olivia Munn on Jon Stewart | 2022 Mark Twain Prize

Martin Sheen

Award-Winning Actor Known for "The West Wing" & "Grace and Frankie;" Social Activist & Humanitarian

Kesha

Pop Singer Known For "Tik Tok," "Your Love Is My Drug" & "Praying"

Laura Dern

Actress, Director, Producer & Activist

Jason Biggs

Actor Known For His Roles in the "American Pie" Series and on "Orange Is The New Black" Among Others

Sophia Bush

Actress, Humanitarian & Author

Maggie Q

TV & Film Actress, Known for Lead Role in CW's "Nikita"

Dr. Michio Kaku

World-Renowned Futurist & Theoretical Physicist

Adrian Grenier

Actor Known for HBO's "Entourage"; Environmental Activist; UN Ambassador

Jillian Michaels

Leading Fitness Expert, Certified Nutritionist, Renowned Life Coach & Powerful Entrepreneur

Tim Gunn

Fashion Icon, Former Co-Host & Mentor of "Project Runway"

Vandana Shiva

World-Renowned Environmental Leader

Kevin Nealon

Former Cast Member of 'Saturday Night Live'; Co-Star on Showtime's "Weeds"

Jeff Orlowski-Yang

Award-winning Filmmaker, Photographer, Entrepreneur & Climate Change Activist

Leland Melvin

Engineer, Former NASA Astronaut & Former NFL Wide Receiver

Danny Trejo

Actor, Author, Activist & Restaurateur; Recovery & Intervention Counselor for Troubled Youth

Alexandra Cousteau

Environmental Activist, Storyteller & Ocean Advocate

Erin Brockovich

Consumer Advocate, Author, TV Host & Environmental Activist