Winona LaDuke

Executive Director of Honor the Earth

Todd Purdum

Senior writer at POLITICO and a contributing editor at Vanity Fair

Janet Mock

Author, Feminist, Transgender Rights Activist, TV Host & Founder of #GirlsLikeUs

Former MythBusters Build Team: Tory Belleci, Kari Byron and Grant Imahara

MythBusters Build Team: Tory Belleci, Kari Byron and Grant Imahara

Anna Escobedo Cabral

Former Treasurer of the United States, Partner at The Cabral Group & Jesse Ball duPont Fund Trustee

Noah Galloway

U.S. Army Veteran, Amputee & Finalist on "Dancing With The Stars"

Monica Pearson

First Female & African-American News Anchor in Atlanta

Diane Rehm

Radio Talk-Show Host

Kevin O'Leary

Founder of O'Leary Financial Group; Venture Capitalist & Financial Expert Known for "Shark Tank"

Tom Silva

General Contractor, Member of Home Improvement Team on "This Old House"

Delvin Choice

Top 8 Finalist on Season 6 of NBC's 'The Voice'

Lance Gross

Actor, Model & Photographer; Best Known for "House of Payne"

Ali Vincent

First Female Winner of "The Biggest Loser"

Taya Kyle

Advocate for Military Veterans & Families; Widow of Former U.S. Navy SEAL Chris Kyle

Amy Waldman

Journalist, Author, "The Submission"

David Williams

Professor of Public Health at Harvard University

Claude Steele

Social Psychologist & Stereotype Expert

Bill Kurtis

TV Journalist, Producer, Narrator and News Anchor; Host of A&E's "Investigative Reports," "American Justice" and "Cold Case Files"

Lou Waters

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

Where Are They Now: Lou Waters

Katie Stevens

Actress & Singer Known for "The Bold Type"