A pilot program in a public high school positions experienced student writing center tutors to become WAC liaisons who foster writing across the curriculum by raising questions, identifying needs, and providing support to their teachers with the goal of strengthening writing instruction school-wide. This article discusses the background and implementation of the program, offers recommendations for how to prepare and guide student liaisons in their work, and presents initial results based on interviews with participating students and teachers. Drawing upon theory, its practical and replicable suggestions demonstrate how to engage high school students as catalysts for change as they subvert traditional hierarchies and collaborate with their teachers as co-contributors to the teaching and learning process.