If the intellectual norms and values embedded in the mathematics education reform movement are to move beyond individual classrooms and significantly influence entire schools and districts, school and district administrators will need to become centrally rather than peripherally involved. This paper discusses the way in which administrators' ideas about the nature of mathematics, learning, teaching, and school culture affect their interpretations of the nature and intent of the mathematics reform movement and their thoughts on how they might support it. In particular, administrators' views of parents' concerns, professional development for teachers, and how new ideas move around in a school are discussed. It is suggested that administrators have well-formed ideas about mathematics, learning, and teaching, and that these ideas influence their views of reform and how to provide support. Contains 28 references. (Author)