When you link to http://www.nctm.org/Publications/mathematics-teacher-educator/About-Mathematics-Teacher-Educator/ to learn about writing a manuscript for publication in Mathematics Teacher Educator (MTE), one aspect of the call for manuscripts that likely stands out is the importance of informing the practice of mathematics teacher education. This directive in the call raises questions such as What is meant by “practice” in the MTE call, considering Lampert's (2010) unpacking of the various ways scholars use this term when talking about teaching? Why do we need work that speaks to the practice of mathematics teacher education? How is mathematics teacher education a practice? Over a decade ago, scholars fervently debated whether teaching, more broadly, is a practice (see Noddings, 2003) and, certainly, the issue is not yet settled. Meanwhile, the demand facing mathematics teacher educators to better educate teachers means more support is needed for those doing the work; mathematics teacher educators continue to face increasing pressure to prepare teachers to engage in more “ambitious teaching” (Newmann & Associates, 1996) than what was expected nearly three decades ago.