Olivia Ward

Winner of "Biggest Loser" Season 11

Andrew Fastow

Former CFO of Enron & Expert on Financial Ethics

Lauren Potter

Actress Best Known for "Glee;" Special Needs Advocate

Lou Waters

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

Where Are They Now: Lou Waters

Pat Smith

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

Dan Mintz

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

Ivan Askwith

CEO and Lead Strategist at Askwith&Co; Former Digital Media Division Lead at Lucasfilm; Kickstarter Campaign Director

Scott McEwen

Attorney & Author of "American Sniper"

Jaslene Gonzalez

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

Dan O'Brien

Olympic Gold Medalist & Decathlon Champion

Melanne Verveer

Director of the Georgetown Institute for Women, Peace & Security at Georgetown University; Former U.S. Ambassador at Large for Global Women's Issues

Lamman Rucker

Actor, Education Activist, Green Living Advocate & Entrepreneur

Renaldo Nehemiah

World Record Holder in the 110 Meter Hurdles; Former Professional Football Player for the San Francisco 49ers

Dr. Bill Conerly

Economist & Future Forecaster

Joshua Prince-Ramus

Architect & Principal of REX Design Firm

Ed Slott

Nationally Recognized IRA Distribution Expert, Professor, Television Personality & Best-Selling Author

Ed Slott, CPA | America's IRA Expert

Philip Zimbardo

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

Charles Limb

Associate Professor of Otolaryngology-Head and Neck Surgery

Charlene Strong

Gay Rights Activist

Louie Schwartzberg

Award-Winning Cinematographer, Director, Photographer and Filmmaker

Malcolm London

Young Poet, Educator, Activist & TED Speaker Known For "High School Training Ground"

Mondo Guerra

Fashion Designer & Advocate for HIV/AIDS Awareness

Debbie Allen

Creative Marketing Expert & Business Speaker

Jody Williams

Humanitarian and Nobel Peace Prize Winner and Chairman of the International Campaign to Ban Landmines

Brittney Griner

WNBA Player for the Phoenix Mercury & Author of "In My Skin"

Brittney Griner's first press conference since being released

Sasha Andreev

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

Dr. Jeffrey Bauer

Health Futurist, Author & Medical Economist

Ed Viesturs

Mountaineer, Known as One Of the U.S.'s Foremost High-Altitude Climbers

John Amatt

Mountaineer, Founder & President of One Step Beyond WorldWide

LaDonna Gatlin

Singer & Author; Sister of the Legendary Country Music Group, The Gatlin Brothers