Although writing-across-the-curriculum (WAC) programs have been commonplace since the 1970s, the focus has largely been on the level of assessment and programmatic development and less on the instructors, particularly graduate teaching assistants (TAs), who adopt these practices. In this article, we describe a pilot WAC graduate-level course in writing pedagogy that our institution developed as part of our recent membership in the Center for the Integration of Research, Teaching, and Learning (CIRTL). We also share how one science, technology, engineering, and mathematics (STEM) graduate student revised her approach to assignment design, feedback, and assessment for a general education course and deepened her understanding of herself as an instructor as well as her students. We end by reflecting on how training in writing pedagogy can support graduate student identity development and improve student learning.