David-Lang, Jenn: - Jenn David-Lang has worked in the field of education for more than twenty-five years as a teacher, administrator, and consultant. Currently, she runs The Main Idea, an annual subscription service that provides monthly summaries of compelling books and professional learning ideas to school leaders throughout the world. In addition, Jenn offers a wide range of consultation, including: designing and providing workshops for leaders and teachers, coaching leaders, and conducting school evaluations.