Standing at the Threshold articulates identity and role dissonances experienced by composition and rhetoric teaching assistants and reimagines the TAship within a larger professional development process. Current researchers and scholars have not fully explored the liminality of the profession’s traditional path to credentialing. This collection reconsiders these positions and their contributions to academic careers.   These authors enrich the TA experience by supporting agency and self-efficacy, encouraging TAs to take active roles in understanding their positions and making the most of that experience. Many chapters are written by current or former TAs who are writing as a means of preparing, informing, and guiding new rhet/comp TAs, encouraging them to make choices about how they want to think through and participate in their teaching work.   The first work on the market to delve deeply into the TAship itself and what it means for the larger discipline, Standing at the Threshold provides a rich new theorizing based in the real experiences and liminalities of teaching assistants in composition and rhetoric, approached from a productive array of perspectives.  Contributors: Lew Caccia, Lillian Campbell, Rachel Donegan, Jaclyn Fiscus-Cannady, Jennifer K. Johnson, Ronda Leathers Dively, Faith Matzker, Jessica Restaino, Elizabeth Saur, Megan Schoettler, Kylee Thacker Maurer