Mayim Bialik

Neuroscientist, Mental Health Advocate & Actress Known for "The Big Bang Theory"

Paul Reiser

Actor, Writer & Stand-Up Comedian Known for Portraying Paul Buchman in "Mad About You"

Dan Abrams

Chief Legal Affairs Anchor at ABC News & Founder of Abrams Media

Sarah Michelle Gellar

Television & Film Actress, Co-Founder of Foodstirs

Debra Messing

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

Jason Alexander

Actor, Writer & Director; Best Known for His Work on "Seinfeld"

Kelly Osbourne

Fashion Designer, Singer & Actress; Former Contributor to E!'s "Fashion Police"; Daughter of Ozzy and Sharon Osbourne

Andrea Mitchell

Host of MSNBC’s "Andrea Mitchell Reports" & Chief Foreign Affairs Correspondent for NBC News

Andrea Mitchell - Celebrating 15 years of "Andrea Mitchell Reports"

Mark Spitz

Legendary Olympic Swimmer; Third Athlete to Win Nine Olympic Gold Medals

Mark Spitz on the 1972 Olympic Games in Munich

Rob Schneider

Emmy-nominated Actor, Comedian & Screenwriter; Former SNL Cast Member

Marlee Matlin

Academy Award Winning Actress; Healthcare Advocate & Disability Rights Activist Fighting for Better Access for the Deaf

Emmy Rossum

Actress Known for Showtime's "Shameless" & Singer-Songwriter

Ashley Tisdale

Actress, Singer & Producer

Melissa Rauch

Actress, Writer & Stand-Up Comic, Best known for "The Big Bang Theory"

Andy Samberg

Actor, Comedian, Rapper & Writer; Known for "Saturday Night Live" & "Brooklyn Nine-Nine"

Gloria Steinem

Feminist Writer, Activist & Organizer; Co-Founder of New York Magazine & Ms. Magazine

Alicia Silverstone

Actress & Animal Rights Activist

Lawrence Summers

Professor & Former President of Harvard University; Former Secretary of the Treasury, Director of the National Economic Council, & Chief Economist of the World Bank

Jenny Slate

Actress, Comedian, Author & Creator of the "Marcel the Shell" Short Films; Known for "Parks & Recreation," "Big Mouth," & "The Secret Life of Pets"

Joseph Gordon-Levitt

Founder of HitRecord & Actor Known for "Inception" & "The Dark Knight Rises"