Ivonne Roman cofounded the Women's Leadership Academy to increase the retention of women in policing.

An active philanthropist, Chris Hemsworth is passionate about ocean conservation and finding solutions to climate change.

Billie Jean King won 39 Grand Slam titles during her tennis career, and has long been a pioneer for equality and social justice.

Jane Fonda has had four extraordinary careers (so far): Oscar-winning actor, author, fitness guru and impassioned activist.

Wendy Suzuki is researching the science behind the extraordinary, life-changing effects that physical activity can have on the most important organ in your body: your brain.

Charmian Gooch is the 2014 TED Prize winner. At Global Witness, she exposes how a global architecture of corruption is woven into the extraction and exploitation of natural resources.

Feras Fayyad's films bear witness to the struggles of his fellow Syrians, as they struggle to survive and save their neighbors.

Deanna Van Buren is an architect who designs spaces for peacemaking, inside and out.

Yvette Alberdingk Thijm helps activists use video and technology to protect and defend human rights.

Peter Gabriel writes incredible songs but, as the co-founder of WITNESS and TheElders.org, is also a powerful human rights advocate.

Reporter Paul Lewis harnesses the power of mobile phones and social media -- innovations that are making every person a potential journalist.

Robert Palmer investigates how the financial system facilitates corruption and other crimes.

In too many countries, it's still normal to torture prisoners for confessions and information. Karen Tse works to end that.

Philip Zimbardo was the leader of the notorious 1971 Stanford Prison Experiment -- and an expert witness at Abu Ghraib. His book The Lucifer Effect explores the nature of evil; now, in his new work, he studies the nature of heroism.

David Baron writes about science in books, magazines, newspapers and for public radio. He formerly served as science correspondent for NPR and science editor for PRI’s The World.

In her book "Citizen Scientist," Mary Ellen Hannibal traces the origins of today’s tech-savvy citizen science movement back through centuries of amateur observations by writers and naturalists.

Writing is only his day job: Dave Eggers moonlights as a publisher, philanthropist and advocate for students and teachers.

Memory-manipulation expert Elizabeth Loftus explains how our memories might not be what they seem -- and how implanted memories can have real-life repercussions.

Malian singer Rokia Traore blends the traditions of her Bamana heritage with a modern singer-songwriter's approach to music-making.

Scott Fraser is a forensic psychologist who thinks deeply about the fallibility of human memory and encourages a more scientific approach to trial evidence.

The transparent simplicity and experiential nature of Olafur Eliasson's work has built his reputation as one of the world's most accessible creators of contemporary art.

Award-winning journalist and author, Will Potter focuses on the animal rights and environmental movements, and civil liberties in the post-9/11 era.

Bursting forth from Canada’s capital, native producer and DJ crew A Tribe Called Red is making an impact on the global electronic scene with a truly unique sound.

Erez Yoeli's research focuses on altruism: understanding how it works and how to promote it.

Janine di Giovanni reports from war zones around the world.

Lucie Pinson works to turn off the tap of financing for fossil fuel expansion and negotiate with banks and insurers on coal, oil and gas exit policies.

In 2004, legendary spacecraft designer Burt Rutan won the $10M Ansari X-Prize for SpaceShipOne, the first privately funded craft to enter space twice in a two-week period. He's now collaborating with Virgin Galactic to build the first rocketship for space tourism.

Already a tireless advocate for positive and honest portrayals of LGBTQ people in media, Tiq Milan now evangelizes for the unifying power of love.

Adam Galinsky teaches people all over the world how to inspire others, speak up effectively, lead teams and negotiate successfully.

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