This volume gathers prominent international scholars to celebrate the complex legacy of Reiner Wiehl, whose work has been instrumental in bringing together the European tradition of prima philosophia as represented by Plato, Spinoza, Kant and Hegel, with the adventurous speculative renewal of the twentieth century by Alfred North Whitehead. Grouped into four sections (Process and Universals, Nature and Subjectivity, Ethics and Civilization, Psychology and Phenomenology) the fifteen papers collected in this book cover a range of topics which is as wide and as intertwined as Wiehl's own expertise. The common thread running through all contributions is the problematic nature of subjectivity and especially of its process slant, which easily eludes the static and abstract schemes of rationality.