Mayim Bialik

Neuroscientist & Actress, Known For "The Big Bang Theory"

Patricia Arquette

Academy Award-Winning Actress Known for "Boyhood"; Activist, Humanitarian & Author

Jared Cohen

President, Jigsaw (previously Google Ideas) & Chief Advisor to Alphabet Executive Chairman (former Google CEO) Eric Schmidt

Alicia Silverstone

Actress & Animal Rights Activist

Sarah Michelle Gellar

Actress; Known for "The Grudge" and "I Know What You Did Last Summer"

Debra Messing

Emmy Award-Winning Actress & Global Ambassador for PSI/Youth AIDS

Debra Messing Shares What She'll Miss Most About "Will & Grace ...

Jeffrey Tambor

Emmy Award-Winning Actor of "Arrested Development," "The Hangover," & For Transgender Role on Amazon's "Transparent"

Nicholas Kristof

Pulitzer Prize-Winning New York Times Columnist & Political Commentator