“…1 Given what is often the very limited scope and duration of TAs’ professional pedagogical training, a substantial amount of a new TA's professional development happens fortuitously (Boyd & Boyd, ; Weimer, Svinicki, & Bauer, ), including, for example, questions about how to support diverse learners within the student body, approaches to differentiating instruction, or compliance with legal mandates determined by the Americans with Disabilities Act of (PL 101‐336) and Section 504 of the Rehabilitation Act of (PL 93‐112). American institutions of higher education make accessibility training available, primarily for full‐ or part‐time faculty and instructors (Cook, Rumrill, & Tankersley, 2009; Gallego & Busch, , ; Salzberg et al, ; Snyder & Dillow, ). However, the effectiveness of the training is often limited and rarely directed toward TAs (Gallego & Busch, , ; Houck, Asselin, Troutman, & Arrington, ; Rao & Gartin, ; Scott & Shaw, ; Sparks, ).…”