Edmund Husserl is widely regarded as one of the most influential philosophers of the twentieth century. The founder of phenomenology, the Logical Investigations is his most famous work. Published in two volumes in 1900, it had a decisive impact on the direction of twentieth century philosophy. It is one of the few works to have influenced philosophers as far apart as Frege and Heidegger and a crucial impact on the development of both continental and analytic philosophy. This is the first time both volumes of this classic work, translated by J.N.Findlay have been available in paperback. They include a new introduction by Dermot Moran, placing the Logical Investigations in historical context and bringing out its importance for contemporary philosophy. These paperback editions of both volumes also include a new preface by Sir Michael Dummett.