The Northeast Massachusetts Community of Practice for Transition Age Youth and Young Adults (MACOPTAYYA) was initiated through the involvement of a champion, a regional director of the state Departmentof Mental Health (DMH). With support from the Transitions Research and Training Center (RTC), the CoP built a partnership of committed stakeholders from various points of the system of service for Transition Age Youth and Young Adults, thus building bridges across the adult and children mental health agencies.