Cheryl Walter NYPD officer • A new member of New York’s finest • Watch: A New York cop

Robert Bullard • Bullard: Green issue is black and white • Watch: Examining environmental justice

Peggy Baker • Volunteer discovers her mission • Watch: Helping out military families

Yanar Mohammed Organization of Women's Freedom founder • Fighting for women’s rights in Iraq

Steve Sloan Legally blind P.E. teacher • Watch: Tackling childhood obesity

Jac Holtzman Record label owner • Confessions of a record label owner

Alison Malmon Active Minds founder • A brother’s suicide sparks a need to help • Watch: Student group confronts mental illness

Cathy Lanier Washington’s police chief • D.C.’s first female police chief not afraid of a challenge • Watch: Washington’s police chief

David Walker Comptroller general of the United States • Economic mess ahead for U.S

Antonio Swad Pizza Patron founder • 'Pizza-for-pesos' policy sparks immigration uproar • Watch: Owner defends controversial dough

Ingrid Mattson President of the Islamic Society of North America • A moderate voice to quell extreme perceptions • Watch: Changing perceptions

Rabbi Marvin Hier Simon Wiesenthal Center founder • Rabbi sees reflections of Hitler in Darfur

David Allen Management consultant and author • Cutting through the clutter

Lt. Gen. David Petraeus Commander of coalition forces in Iraq • 'Warrior-scholar' to lead troops in Iraq

Felicia Palmer Hip-hop entrepreneur • Taking hip-hop to new heights

John Folsom Wounded Warriors founder • A fighter for families • Watch: Folsom discusses Wounded Warriors

Antonio Villaraigosa Los Angeles mayor • A mayor cracks down on gangs • Watch: Villaraigosa discusses Los Angeles gangs

John Hope Bryant Operation Hope founder • Hope isn’t just a middle name

Shannon Lucid Astronaut • Legendary astronaut still finds herself star-struck • Gallery: The Lucid legend

Deval Patrick Massachusetts governor • Massachusetts governor seeks to connect with citizens • Watch: Patrick talks about being a historical figure

Tavis Smiley Radio and TV talk show host • Smiley tackles issues to make America “better” • Watch: TV talk show host wants to make a difference

Frank Warren Founder of PostSecret.com • The keeper of secrets • Gallery: Some of the secrets of postsecret.com

Sen. Jim Webb Democratic senator from Virginia • Webb: GOP has lost ‘moral high ground’ • Watch: The newly elected senator

John Shalikashvili Former Chairman of the Joint Chiefs of Staff • A general’s about-face on gay troops • Watch: Shalikashvili’s story

Mignon Fogarty Technical writer and podcaster • ‘Grammar Girl’ quick and dirty success

Dr. Anthony Fauci Director of the National Institute of Allergy and Infectious Diseases • Bio: Working for cures on diseases • Watch: Fauci describes his work

Felipe Calderon President of Mexico • Bio: Calderon’s rise to power • Watch: Calderon describes his goals

Angelina Jolie Actress/Philanthropist • Bio: Jolie advocates aid for refugees

Indra Nooyi PepsiCo president and CEO • Bio: Changing the face at PepsiCo • Watch: The power at Pepsi

C. Britt Beemer Founder of America’s Research Group • Bio: Leading the way through research • Watch: Beemer studies consumers