The Puget Sound Professional Development Center (PSPDC) was established in 1989 as a partnership between the University of Washington and four middle schools. PSPDC has created collaborative and substantial teacher leadership roles. In performing the role of teacher leader coordinator (TLC), teachers: (1) were fully participating members of the PSPDC planning and policy making committee; (2) worked to connect the PSPDC mission to their schools and to bring the school's point of view to bear on that mission; and (3) collaborated with peers to promote further teacher leadership and to implement the PSPDC vision. Four TLCs participated in this study to determine how teachers share leadership in a collaborative professional development school. Interviews, observations, and artifact analyses yielded six tentative hypotheses: (1) TLCs influence the direction of PSPDC by being the rudder or at times the brakes; (2) TLCs rely on the bureaucratic legitimacy of the PSPDC or the school to gain compliance; (3) TLCs initially lead their peers by following the path of least resistance; (4) TLCs lead their peers by using persuasive techniques; (5) in the leadership role, the TLCs attend to the feelings of all involved; and (6) with time, TLCs established their own aura of leadership, and thereby began to legitimize their position with their peers. (IAH)