This memorial volume honors the life and work of Akito Arima (1930-2020), a distinguished physicist and educator who made significant contributions to nuclear physics and beyond. Through a series of heartfelt essays, personal recollections, and scientific papers, this book reflects Arima's profound influence on the field and his legacy in shaping global scientific discourse. Arima is best known for his development of the Interacting Boson Model and his pioneering work on nuclear structure, which laid the groundwork for much of today's research in nuclear theory. Additionally, his efforts in improving the educational landscape in Japan and his advocacy for scientific policy made him an instrumental figure in both the scientific community and politics. The contributions in this volume explore a wide range of topics, from the technical aspects of nuclear physics to his role in shaping science policy, with a particular focus on his lasting impact on academia, research, and society. Through tributes from students, colleagues, and friends, the book provides a comprehensive look at a remarkable career and the enduring legacy of a scientist whose influence transcended the laboratory.