Selena Gomez

Actress & Singer; Best Known for "Wizards of Waverly Place"

Tim Tebow

ESPN College Football Analyst; Heisman Trophy Winner; Former Quarterback for NFL's Denver Broncos & Baseball Outfielder for the New York Mets

Kurt Warner

Super Bowl Champion Quarterback and Two-Time NFL MVP; Adoption Advocate

Brandon Marshall

Former NFL Pro Bowler, TV Personality, Mental Health Advocate, Founder, Host of I AM Athlete & CEO of House of Athlete

OK Go

Alternative Rock Band Known for Inventive Music Videos Like "Here It Goes Again" and "I Won't Let You Down"

Dr. Dean Ornish

Physician, Leading Researcher in Healthcare, Founder of the Preventive Medicine Research Institute & Bestselling Author

Milla Jovovich

Model, Actress & Musician Known for the "Resident Evil" Series

Gregory Boyle

Roman Catholic Priest of the Jesuit Order; Founder of Homeboy Industries

R "Ray" Wang

Founder, Chairman & Principal Analyst at Constellation Research; Author of "Disrupting Digital Business"

Ben Goldacre

Physician; Best-Selling Academic & Science Writer

Graham Hill

Founder of Life Edited & TreeHugger.com

Bethany Joy Lenz

Actress, Singer-Songwriter & Filmmaker; Known For "One Tree Hill"

Laura Arrillaga-Andreessen

Philanthropist, Educator, & Author Known for "Giving 2.0"

Misha Collins

Actor Known for the CW TV Series "Supernatural" & Founder of Random Acts

Misha Collins on getting his kids approval to be in ‘Gotham Knights’

Jose Antonio Vargas

Journalist, Filmmaker & Immigration Activist

Kathryn Schulz

Pulitzer Prize Winning Journalist & Author; Staff Writer at The New Yorker

Gary Slutkin

Epidemiologist & Founder/Executive Director of Cure Violence

Jean Case

Chair of National Geographic Society, CEO of the Case Foundation & Founder of ForWhatItsWorth; Author of "Fearless: Five Principles for a Life of Breakthroughs and Purpose"

Jean Case + Bloomberg TV at Milken Institute Global Conference

Nancy Lublin

Founder & Former CEO of Crisis Text Line

Johanna Blakley

Expert in Popular Culture, Digital Technology and Entertainment