IronE Singleton

Best known as Theodore "T-Dog" Douglas on AMC's "The Walking Dead"

Sasha Andreev

Actor, Emcee & Host of HGTV's "Curb Appeal"

Vilayanur Ramachandran

Neuroscientist; Director of the Center for Brain & Cognition, University of California, San Diego

Mally Roncal

Makeup Artist & Creator of Mally Beauty

Mally Roncal - Rachael Ray Show

Philip Zimbardo

Psychologist Known for the Notorious '1971 Stanford Prison Experiment;' Researcher of the Psychology of Heroism, Evilness and Time

Chuck Hughes

Canadian Chef, Restaurateur, and Host on the Food Network & Cooking Channel

Michelle Aguilar

Winner of NBC's "The Biggest Loser" Season 6, Author, Motivational Speaker

Sean Lowe

Businessman, Author & Former Reality TV Personality from "The Bachelor"

Dan Mintz

Comedian and Voice Actor; Known for Playing Tina Belcher on "Bob's Burgers"

Ahmed Hassan

Celebrity Landscaper & TV Host of DIY's Yard Crashers, Blog Cabin, Turf War

Vanessa Ochs

Author of "Inventing Jewish Ritual", Winner of 2007 National Jewish Book Award, Professor of Religious Studies at University of Virginia

Streeter Seidell

Comedian, Writer for SNL & Contributor to CollegeHumor.com

Jaslene Gonzalez

Puerto Rican-American Model, TV Host & Winner of America's Next Top Model; Founder of "On Set with Jaslene"

Jennifer Senior

New York Times Book Critic; Best-Selling Author of "All Joy & No Fun: The Paradox of Modern Parenthood"

Pat Smith

TV Persona, Entrepreneur, President & CEO of Emmitt & Pat Smith Enterprises

Lou Waters

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

Where Are They Now: Lou Waters

Michael C. Anthony

Bestselling Author, Body Language Expert & Kidney Disease Survivor

Katie Stevens

Actress & Singer Known for "The Bold Type"

Olivia Ward

Winner of "Biggest Loser" Season 11

Robert Putnam

Professor of Public Policy, Harvard Kennedy School of Government; Author of "Our Kids"