Teachers at every level—from kindergarten through college—are the agents of reform; universities and schools are ideal partners for investing in that reform through professional development. Writing can and should be taught, not just assigned, at every grade level. Professional development programs should provide opportunities for teachers to work together to understand the full spectrum of writing development across grades and across subject areas. Knowledge about the teaching of writing comes from many sources: theory and research, the analysis of practice, and the experience of writing. Effective professional development programs provide frequent and ongoing opportunities for teachers to write and to examine theory, research, and practice together systematically. There is no single right approach to teaching writing; however, some practices prove to be more effective than others. A reflective and informed community of practice is in the best position to design and develop comprehensive writing programs. Teachers who are well informed and effective in their practice can be successful teachers of other teachers as well as partners in educational research, development, and implementation. Collectively, teacher-leaders are our greatest resource for educational reform. NWP sites share a national program model, adhering to a set of shared principles and practices for teachers’ professional development, and offering programs that are common across the network. In addition to developing a leadership cadre of local teachers (called “teacher-consultants”) through invitational summer institutes, NWP sites design and deliver customized inservice programs for local schools, districts, and higher education institutions.