Jean-Clet Martin offers an insightful reading of Deleuze, from the point of view of a student, a reader and a fellow philosopher with whom Deleuze himself corresponded about his work. The letter-preface that Deleuze provided for the original French publication of Variations testifies to the confidence that Deleuze had placed in him. Equally at home in Kant's critical philosophy, baroque art, the mathematics of the virtual and the Anglo-American novel, Martin delivers a philosophically rigorous and seductive literary-style reading of Deleuze's work which will serve the student and the Deleuze scholar equally well. This is the first translation of Martin's work in English and as such is essential reading for anyone dedicated to the study of Deleuze. Martin has provided a new postscript for the translation, which brings his text into the present and anticipates his new work that will rekindle the discussion on Deleuze's relationship to Hegel.