Bill Drayton is an American social entrepreneur best known for founding Ashoka, an organization that supports social innovators and entrepreneurs around the world. He has played a significant role in promoting the idea of "citizen sector" and encouraging individuals to take action to solve social problems. Drayton has a background in law and business, having studied at Harvard University and Stanford University. His work has influenced the development of social entrepreneurship as a field, inspiring many to create sustainable solutions for various social issues.