This volume is the first book-length analysis of the problematic concept of the ?horizon? in Edmund Husserl?s phenomenology, as well as in phenomenology generally. The author shows in this authoritative exploration of the topic that Husserl, the originator of phenomenology, placed the notion of the horizon at the centre of philosophical enquiry. He also demonstrates the rightful centrality of the concept of the horizon, all too often viewed as an imprecise metaphor of tangential significance.