In their 2012 Annual Conference keynote address, Michael Fullan and Andy Hargreaves discussed the major tenets of their book, Professional Capital: Transforming Teaching in Every School (2012). The ideas at the heart of their book are the foundation of our commitment to effective collaboration as key to improving schools for students and their teachers. Hargreaves and Fullan write about the important roles of human and social capital in sustained improvement. Human capital is about the qualities of individuals. In the context of schools, human capital is a teacher’s cumulative abilities, knowledge, and skills developed through formal education and on-the-job experience. Many reform efforts have focused on improving just this aspect of capital. In some situations, accountability becomes the primary driver for improvement, while in others,