Ginger Zee

Chief Meteorologist for ABC News, Author & Mental Health Advocate

Matt McGorry

Actor Known for "Orange is the New Black" & "How to Get Away with Murder;" Feminist & Social Change Advocate

Tracy Pollan

Emmy Award-Nominated Actress & Author, Known for "Family Ties"; Advocate for Parkinson's Disease

Michelle Gielan

National CBS News Anchor Turned Positive Psychology Researcher; Bestselling Author of "Broadcasting Happiness"

Chrissy Teigen

Model, Author & Television Personality

Rudolph E. Tanzi

Alzheimer's Disease Researcher; Expert on the Genetics of Neurological Disease; Professor of Neurology at Harvard Medical School

Tim O'Reilly

Founder & CEO of O'Reilly Media

Kristen Johnston

Emmy Award Winning Actress; Best Known for "3rd Rock From The Sun"

Kristen Johnston Candidly Opens Up About Her Battle with Lupus ...

Alonzo Mourning

Former Professional Basketball Player, Seven-time NBA All-Star; Inducted into the Basketball Hall of Fame

Alfonso Ribeiro

Host of America’s Funniest Home Videos, Actor, TV Director, Award-Winning Dancer & Broadway Star

Brandon Marshall

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

John Zogby

Trendspotter & Leading Pollster

Bakari Sellers

Author, Attorney, Political Commentator & Youngest African American Elected Official in the U.S.

Danny Glover

Acclaimed Actor, Producer & Leading Social Activist; Epilepsy Survivor

Bill Walton

Basketball Legend, Broadcaster & Humanitarian

Julia Sweeney

Former SNL Cast Member, Monologist, Cancer Survivor & Author

Marc Summers

Television Host of Food Network's "Unwrapped", Spokesperson for Obsessive Compulsive Disorder, Co-Author of "Everything In Its Place"

Rachel Simmons

Internationally Recognized Educator & Best-Selling Author

Marci Rossell

Economic Forecaster, Financial Expert, Former CNBC Chief Economist & Co-Host of "Squawk Box"

Al Roker

Co-Host NBC Today Show Media Entrepreneur, Author