After setting a record for sailing around the world, Dame Ellen MacArthur has turned her attention toward creating a more "circular" economy -- where resources and power recirculate and regenerate.

Emily Nagoski teaches women to live with confidence and joy inside their bodies.

Amber McReynolds's vision is to create election systems that put voters first and improve the voting experience for all.

As director of The Vaccine Confidence Project, Heidi J. Larson works to evaluate and address vaccine hesitancy.

In her groundbreaking book Girls & Sex, Peggy Orenstein explores the changing landscape of modern sexual expectations and its troubling impact on adolescents and young women.

Mindy Scheier is the founder of the Runway of Dreams Foundation. Prior to launching the nonprofit, Mindy spent over 20 years working in fashion as a key member of the design team for the INC collection and stylist for Saks Fifth Avenue in New York City.

Matthew Williams believes that sport has the power to change lives.

Musician Emily King is living proof that if you want to change your mind (and your art), the best thing you can do is change your scenery.

Aimée Eubanks Davis believes that our next generation of leaders will emerge from everywhere.

An illustrator and graphic journalist with a background in social work, Wendy MacNaughton believes drawing is an essential tool to help everyone -- young and old -- slow down, look closely and connect with one another.

Susan Robinson is a business leader, inspirational speaker, blogger, entrepreneur and TED Resident. And she is legally blind.

Rory Stewart -- a perpetual pedestrian, a diplomat, an adventurer and an author -- is the member of British Parliament for Penrith and the Border.

Meaghan Ramsey believes in business growth that stems from real social change.

Dr. Jessica Garza is an accomplished global business, sport and transformational coach, speaker and author.

In addition to her incredible WNBA basketball career, Renee Montgomery is a vocal advocate for equality and social justice reform.

Strategic planner Thomas Barnett has advised US leaders on national security since the end of the Cold War. His bold ideas about the future of warfare and the military are spelled out in his best-selling book The Pentagon's New Map.

Recognized as one of the greatest scientific innovators of our time, Joanne Chory studies the genetic codes of plants. Her goal: to use plants to help fight climate change.

TED Fellow Matilda Ho is shaping the startup landscape to create more sustainable food systems in China.

Kevin B. Jones is a life-long student of human nature, fascinated most by the decision-making capacity intrinsic to each of us.

A political strategist focused on creating a better future, Tom Rivett-Carnac works at the highest levels of business and government to find creative ways to accelerate solutions to the climate crisis.

Darieth Chisolm is an Emmy-winning television personality, former NBC News Anchor, entrepreneur, author, international speaker and life and business coach.