Heidegger on Kant, Time and the 'Form' of Intentionality

Between 1927 and 1936, Martin Heidegger devoted almost one thousand pages of close textual commentary to the philosophy of Immanuel Kant. This article aims to shed new light on the relationship between Kant and Heidegger by providing a fresh analysis of two central texts: Heidegger’s 1927/8 lecture course Phenomenological Interpretation of Kant’s Critique of Pure Reason and his 1929 monograph Kant and the Problem of Metaphysics. I argue that to make sense of Heidegger’s reading of Kant, one must resolve two questions. First, how does Heidegger’s Kant understand the concept of the transcendental? Second, what role does the concept of a horizon play in Heidegger’s reconstruction of the Critique? I answer the first question by drawing on Cassam’s model of a self-directed transcendental argument, and the second by examining the relationship between Kant’s doctrine that ‘pure, general logic’ abstracts from all semantic content and Hume’s attack on metaphysics. I close by sketching the implications of my results for Heidegger’s own thought. Ultimately, I conclude that Heidegger’s commentary on the Critical system is defined, above all, by a single issue: the nature of the ‘form’ of intentionality.