Through his William J. Clinton Foundation, former US President Bill Clinton has become a vital and innovative force for world change. He works in four critical areas: health, economic empowerment, citizen service, and reconciliation.
Helen Walters is the head of curation at TED, where she has the privilege of overseeing the work of an absurdly talented group of specialist curators and deep thinkers to bring the very sharpest minds and ideas to the TED stage.
Kola Masha is the founder of Babban Gona, the first for-profit social enterprise in history to be awarded the prestigious Skoll Award, due to its financial sustainability and highly scalable impact. The organization is part-owned by the farmers they serve.
Tim Jackson is a British ecological economist and professor for sustainable development at the University of Surrey. He is the author of "Prosperity without Growth" and director of the Centre for the Understanding of Sustainable Prosperity.
Dr. Kakenya Ntaiya is the founder and president of Kakenya's Dream, an international nonprofit organization leveraging education to empower girls, end harmful traditional practices and transform communities in rural Kenya.