Drawing on his extensive career, John Marks provides a practitioner’s guide to the underlying principles of social entrepreneurship. Marks uses his own experiences of creating real-life breakthroughs during his time leading Search for Common Ground, which he founded and built with his wife, Susan Collin Marks, into the world's largest peacebuilding nonprofit. Beginning with an improbable effort to promote cooperation between the CIA and the KGB, this book features examples that range from helping prevent genocide in Burundi to using children's television to lessen ethnic tensions in Macedonia to creating a culture of mediation in Morocco.