Mayim Bialik

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

Selma Blair

Actress; Multiple Sclerosis Survivor; Healthcare & Disability Advocate

Tiffany Shlain

Founder of The Webby Awards; Emmy-Nominated Filmmaker, Bestselling Author, Internet Pioneer & Futurist

Aaron David Miller

Senior Fellow, Carnegie Endowment for International Peace

Chelsea Handler

Comedian, TV Personality & Author

Andy Borowitz

New York Times Best-Selling Author and Comedian; Creator of the Borowitz Report

Sarah Michelle Gellar

Television & Film Actress, Co-Founder of Foodstirs

Henry Winkler

Actor, Producer, Director & Best-Selling Author; Best Known for "Happy Days"

Lou Waters

Aging Expert, Journalist & Former CNN Media Personality; Anchor of "Coming of Age"

Where Are They Now: Lou Waters

Scott Turow

Attorney & 11-Time Bestselling Author

Susan Stamberg

Nationally Renowned Broadcast Journalist & NPR Special Correspondent

Joshua Sparrow

Executive Director of the Brazelton Touchpoints Center, Associate Clinical Professor at Boston Children's Hospital

Rachel Simmons

Internationally Recognized Educator & Best-Selling Author

William Shatner

Emmy-Award Winning Actor, Known for "Star Trek" & "Boston Legal"

Deborah Perry Piscione

Best-Selling Author, Entrepreneur & Thought Leader on the Future of Work

Thomas Perls

Geriatrician & Researcher in Human Exceptional Longevity at Boston University; Principal Investigator of the National Institute on Aging

Norman Ornstein

Bestselling Author, Political Analyst & Resident Scholar at the American Enterprise Institute

Michael Oren

Israel's Ambassador to the U.S. From 2009-2013 and Author of New York Times Best Seller "Ally"

Michael Medved

Nationally Syndicated Radio Talk Show Host, Film Critic & Bestselling Author

Michael Medved: God's Hand on America

Howie Mandel

Comedian, Actor, TV Host & Judge on "America's Got Talent"