This study focused on the perceptions of in-service general education teachers who completed a cohort mentoring program leading to certification in English as a Second Language (ESL) at a large, urban university. Based on interviews with 19 members of a cohort of 28, participants valued both the support and augmented skills-development the mentoring element afforded and the supportive, collaborative environment provided by the cohort model. Many also reported that the ESL-targeted strategies they learned were helpful in teaching all student populations and that program participation contributed to their increased involvement in leading professional development and, for some, to their intention to seek administrative roles. Based on these findings and the literature reviewed, the program examined may represent a model that can help to meet the demonstrated need for more trained ESL teachers in U.S. schools and can contribute to developing school leaders.