How does practitioner inquiry impact education? Examining the experiences of practitioners who have participated in inquiry projects, the authors present ways in which this work has enabled educators to be positive change agents. They reveal the difference that practitioner inquiry has made in their professional practice, their understanding of student learning, their content area knowledge, and their career trajectories. Attesting to long-lasting changes in ways that these educators approach professional challenges, the authors identify the "ripple effect" of these changes through school communities and beyond. "Impactful Practitioner Inquiry" includes in-depth case studies as well as chapters specifically focused on the design and analysis aspects of inquiry. Book features include: (1) An examination of how practitioner inquiry impacts professional practice, school culture, and career trajectories; (2) The use of complexity and network theories to understand how practitioner inquiry is able to create its ripple effect; (3) Testimonies from educators with up to 10 years' experience as inquirers; and (4) Practices from early childhood and school settings, classroom and leadership roles, general education and specialist settings.