This article reports the research findings of a qualitative study thatemploys case study research methods to examine a newly-formed university-district-teacher union partnership. Examination of the question ''How do we better prepare teachers'' led to the formation of a university-district-association (teacher union) partnership, which led to a new question: How do the roles of principal and liaison in a Professional Development School affect pre-service and tenured teacher learning? The school-university partnerships' mission was to design a mutually beneficial program of teacher preparation and tenured teacher professional development. Findings determined that there were significant perceived mutual benefits; notable benefits for the school partner appeared in the unexpected roles of tenured teacher, principal, and liaison. The study's finding have implications for the universities that prepare teachers, teaching practitioners, school and district leaders, and even state and national policy makers. (Contains 1 table.)