The author argues that students' persistent struggles with mathematics suggest a new form of professional development for teachers is needed. The author draws on a model of professional learning in literacy education to propose an analogous model for mathematics education: teachers of mathematics need to produce mathematical ideas, themselves, in order to better support their students in becoming mathematical thinkers. It is not enough to focus singularly on developing teachers' content understanding, however, because mathematical ideas are embedded within their representational forms; therefore, any content-related professional development must also include pedagogical discussions. The author concludes by describing a research-based, high-quality professional development community--the Philadelphia Area Math Teachers' Circle (PAMTC)--in which authentic mathematical inquiry and pedagogical analysis occur hand-in-hand.