This volume is coauthored by Joshua Mauldin, theologian and Associate Director of the Center of Theological Inquiry, and Michael Spezio, psychological scientist and Associate Professor of Psychology, Data Science, and Neuroscience at Scripps College. They co-led, with Dr. William Storrar, Director of the Center of Theological Inquiry, a two-year cross-training program at the Center (2023-2025) to help theologians better understand and develop theologies of human thriving. The program was funded by The John Templeton Foundation. The book will be accompanied by an online, CTI-affiliated video series, already recorded and in the final stages of editing. Both the book and the accompanying series make the most significant elements of the CTI cross-training program available to theologians, philosophers, religious studies scholars, and their Ph.D., D.Min., M.Div. students. The book will also be accessible to more advanced undergraduates, and to practicing ministers, Christian education leaders, and others with an interest in Theology and human thriving. The book's main thesis, demonstrated in each of its chapters, is that Theology that seeks to understand human thriving in the 21st Century can best work by theoretically and practically engaging Psychological Science as a science, and not primarily as a worldview or ontology or as a set of broad and intuitively appealing ideas that have minimal connection with evidence from published scientific work with real people. Each chapter will help the reader access Psychological Science relevant to understanding human thriving and will end by pointing to possible future directions for theologies of thriving. The chapters go far beyond what is usually found in popular books written for the general public. Popularized books often make claims that go well beyond what the science can comfortably say, and when they do that, the general reader is generally not in the know. There is no other published volume that attempts to do what this book does. There are other books relating Theology to Psychological Science or to Clinical Psychology or to Neuroscience, sometimes touching on questions of human thriving. However, those are typically written by nonscientists or by nontheologians, with limited or no engagement of primary scientific or theological literature. Certainly they do not bring students of theology or religion, or religious and confessional communities, into accessible engagement with the theory and methods of the areas of psychological science relevant to understanding human thriving from religious and theological perspectives. The few volumes coauthored by theologians and practicing psychological scientists (e.g., Did My Neurons Make Me Do It? by Nancey Murphy and Warren Brown) do not directly address theories of wellbeing and thriving, while generally avoiding a thorough presentation and consideration of the relevant scientific literature.