There is increasing interest in researcher-practitioner partnerships, particularly those that take the form of a networked improvement community. In this paper, we describe the partnership between the National Center on Scaling Up Effective Schools and the Fort Worth Independent School District to build student ownership and responsibility. By outlining the organizational structures established to enact the partnership and roles of our various partners, we provide an in-depth look at how one researcher-practitioner partnership operates. We begin by describing the concept of an improvement community as one type of partnership, identify several types of improvement communities currently operating in educational systems, and define the key features of improvement communities. Then, we outline the specific improvement communities that are central to the Center's work, highlighting how these structures help us enact our partnership. We end with our reflections about how the partnership created new roles for both researchers and practitioners as well as the challenges and opportunities that accompanied those new roles.