Purpose: By engaging levels of W/writerliness, this paper aims to identify how English Language Arts teachers' personal and professional W/writerly identities impact their performance of pedagogical agency. Design/methodology/approach: In this narrative inquiry, the author draws on theories of writing identity and agency to analyze how four mid-career English teachers' personal beliefs around writing intersect with their professional practice. Data sources include interviews, journal entries and classroom observations. Findings: Nuanced differences in teachers' W/writerly identities produce more substantial differences in their pedagogy, especially impacting their performance of agency to (re)define successful writing outcomes and to balance process and product in their writing instruction. Practical implications: This paper presents one method to expand preservice and in-service English Language Arts (ELA) practitioners' approaches to teaching writing even alongside limitations of their teaching context by (1) emphasizing their ownership over their own writing in university methods courses; (2) leading teachers on an exploration of W/writerly identities; and (3) investigating ways teachers can transfer their personal and professional learning to students via their own pedagogical agency. Originality/value: The study extends the work of scholars in the National Writing Project, suggesting that nuanced exploration of ELA teachers' W/writerly identities in preservice and in-service settings could increase their sense of agency to work against and within cultures of standardization.