Nobel Peace Prize Winner Ellen Johnson Sirleaf
Africa's first elected female head of state shares the prestigious prize with two others who have fought for the rights of women.
Photos: Robin Williams' Career
Comedian Robin Williams has achieved international stardom for his work on both stage and screen
10 Questions for Robert Redford
In a career spanning over a half century, Robert Redford has worked as an actor, film director, businessman, model, environmentalist and founder of the Sundance Film Festival
10 Questions for Lisa Jackson
Lisa Perez Jackson serves as the Administrator of the Environmental Protection Agency (EPA)
Dan Savage
Dan Savage is an internationally syndicated advocate and author. Outspoken on sex, love and relationships, he has been changing the way his readers think and act in and out of the bedroom since 1991
Photos: David Brooks
David Brooks is an American political and cultural commentator
Mike Tyson
The youngest heavyweight champion in boxing history, Mike Tyson is also one of the sport's most notorious figures
10 Questions for IBM's Watson
An artificial intelligence computer system developed by IBM, Watson the computer is capable of answering questions that are posed in natural language
Photos: Michael Bloomberg
Michael Bloomberg is the current Mayor of New York City and the founder and owner of Bloomberg L.P., a financial news and information services media company
Actor Jim Parsons
Jim Parsons is an American television and film actor best known for playing Sheldon Cooper on the CBS sitcom The Big Bang Theory
Wendy Kopp
While still a student at Princeton University, Wendy Kopp developed a proposal to create a national teaching corps
Michelle Williams
Michelle Williams is an American actress with an extensive career in television and film
Jimmy Wales
Jimmy Wales is an American Internet entrepreneur best known for helping to start up the web-based encyclopedia, Wikipedia
Jeff Bridges' Career
The actor has been nominated for his work with the Coen brothers on True Grit
Nassim Taleb
Former options trader Nassim Taleb is an essayist specializing in issues of probability, most famously developed in the influential 2007 book, The Black Swan
Ray Kurzweil
Ray Kurzweil is a renowned author, inventor, entrepreneur, and visionary
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