This collection of essays celebrates the 70th birthday of Professor Roland Naul. The chapters, written by colleagues and friends, illustrate the development of sport and physical activity research over four decades. They give an overview and update of relevant fields that determined the academic work of Roland Naul and new insights. The chapters have been grouped under the following aspects: Roland Naul as Schola Ludens Europaeus, with a focus on his special fields of interest and research; general education and sport education including the relationship between sport pedagogy and social pedagogy; old and new challenges for the Olympic Games movement, as described from the perspective of different countries; health-enhancing physical activity (HEPA), a key policy area which Roland Naul has helped shape in the European Union; and finally, sport policy on a local level. This commemorative publication acknowledges the merits of Roland Naul for European studies in physical education and youth sports, as well as for the sport policy context in Europe.