The Innermost Kernel recounts the physicist and Nobel Laureate Wolfgang Pauli and his interest in Jungian psychology, philosophy and western world-view. It is also an exploration of the intellectual setting and context of Pauli's thinking, which has its starting point in the cultural and intellectual climate of fin-de-siecle Europe. As a contribution to the general history of quantum physics this study has a special focus on the psychological and philosophical issues discussed by physicists belonging to the Copenhagen school. The work is mainly based on the correspondence of the principle characters and explores some of the central issues discussed there, as for instance the subject-object relation, complementarity, the relation of conscious and unconscious, the process underlying concept-formation, the psychology of scientific discovery, the symbolic world of alchemy, the theories of archetypes and of synchronicity. Ultimately this book is about a remarkable scientist searching for a new understanding of the interrelatedness of man and world.