After studying and working on public health issues, both in Lebanon and the United States, Teresa Chahine wanted to move from identifying and understanding societal problems to trying to fix them. While at Harvard’s T.H. Chan School of Public Health she was exposed to the teaching of social entrepreneurship “across the river” at the university’s business school. Inspired by the promise of this relatively new discipline, she created her own course on the subject at the Chan School and now has written a definitive textbook on the subject. She is now inspiring students at the Yale School of Management with the promise of how effective social entrepreneurship can help improve our world.