In this episode of Missiology Shelf, we dive into the book Missional Life in Practice and Theory, edited by Chris Flanders and Greg McKinzie, a Festschrift honoring the enduring impact of Gailyn Van Rheenen on mission theory and practice. Chris and Greg reflect on their personal experiences with Van Rheenen, discuss his pioneering role as a "missionary theologian," and explore the essential connection between theory and practice in missional engagement. The conversation also highlights Van Rheenen's global influence, his innovative concepts like the missional helix, and the evolving landscape of missiology in today's context.