Bill Nye

"The Science Guy"; Science Communicator, TV Presenter & Mechanical Engineer; Climate Change Activist

Pat Williams

Motivational Speaker & Sports Executive; Senior Vice President of the NBA’s Orlando Magic

Ben Stein

Political Economist, Commentator, Author & Actor

Dr. Kevin Freiberg

World-Wide Best-Selling Author, Speaker & Advisor

Judah Friedlander

Standup Comedian & Actor Known for his Role in "30 Rock"

Tavis Smiley

Broadcaster, Author, Publisher, Advocate, and Philanthropist

Joel Zeff

Emcee, Workplace Expert, Author & Humorist

Dave Barry

New York Times Best-Selling Author & Humorist

Swamp Story: A Novel

John Hodgman

Resident Expert on "The Daily Show with Trevor Noah", Author, Humorist

Patch Adams

Physician & Clown; Founder of Gesundheit Institute; Inspiration for the Robin Williams Movie "Patch Adams"

Dr. Jackie Freiberg

Corporate Culture & Leadership Strategist, Best-Selling Author of "Do Something Now"

Joy Behar

Comedian, Actress & Former Co-Host of "The View"

Kristen Schaal

Actress, Stand-Up Comedian & Writer

Kristen Schaal's Daughter Is Not A Kristen Schaal Fan | CONAN

Jon Stewart

Talk Show Host, Comedian & Producer

Jon Stewart will return to ‘The Daily Show’ as host — just on Mondays

Tim Clue

Professional Humorist, Corporate Entertainer & Motivational Speaker

Jason Alexander

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

Paul Reiser

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

Ross Shafer

Six-Time Emmy Award-Winning Comedian, Business Researcher, TV Host & Bestselling Author

Kathy Najimy

Award-Winning Actress & Activist

Linda Ellerbee

Award-Winning Journalist & Television Producer; Breast Cancer Survivor