David Cross

Emmy Award-Winning Actor, Comedian, Producer & Writer

David Cross Can't Be Confined To The Late Show's Guest Chair

Mark Moffett

Entomologist, Nature Photographer & Author

Thomas Pogge

Philosopher Thomas Pogge wants to ensure medications get to those who need it most. He has published on a wide range of subjects such as global justice and human rights.

Willie Smits

Trained Forester, Microbiologist, Conservationist, Animal Rights Activist, Wilderness Engineer & Social Entrepreneur

Tommy Davidson

Comedian & Actor Known for "In Living Color" and "Black Dynamite"

John P Donoghue

Henry Merritt Wriston Professor, Department of Neuroscience, The Warren Alpert Medical School; Director, Brain Science Program, Brown University

Craig Biggio

Hall of Fame Former Second Baseman & Catcher for the Houston Astros

Jennifer Jako

Activist & HIV/AIDS Educator

Arthur Caplan

Drs. William F and Virginia Connolly Mitty Professor and founding head of the Division of Bioethics at New York University Langone Medical Center in New York City

Colby Donaldson

Cast member of "Top Shot" on the History Channel

Dave Salmoni

Animal Planet Television Personality & Large Predator Expert

Disco Biscuits

The Disco Biscuits is a jam band band from Philadelphia, Pennsylvania. The band consists of Allen Aucoin (drums), Marc Brownstein (bass), Jon Gutwillig (guitar), and Aron Magner (keyboards, synths).

Earthquake

Stand-Up Comedian

Paul DiMeo

TV Personality & Carpenter; Best Known for ABC's "Extreme Makeover Home Edition"

Richard Louv

Non-Fiction Author & Journalist; Best Known for "Last Child in the Woods: Saving Our Children From Nature-Deficit Disorder"

Matt Light

Former NFL New England Patriots Offensive Tackle

Harriet A. Washington

Award-Winning Medical Writer & Editor

Samuel Shem

Medical Expert, Psychiatrist, Acclaimed Novelist, Playwright, Essayist & Activist

Adam Greenfield

Founder & Managing Director of Urbanscale LLC.

Eric Lewis

Concert Pianist & Jazz Musician