<!doctype html public «-//w3c//dtd html 4.0 transitional//en»> http-equiv=content-type content="text/html; charset=iso-8859–1"> This book explores the language biographies of plurilingual and monolingual teachers, drawing on theories of teacher cognition and linguistic identity. It shows how circumstantial and elective experiences constitute powerful resources contributing to their professional knowledge and beliefs, and calls for the valuing of these resources in teacher education.