This thesis seeks to provide a novel interpretation of Heidegger’s project in the late twenties and of its breakdown and transformation around the turn of the decade. I argue that Heidegger develops a unified project in the late Marburg period that is constructed around the question of the unity of the concept of being in light of its regional multiplicity. Furthermore, I argue that Heidegger’s conception of the framework of this project is highly influenced by his reception of Kant in (...) this same period. Specifically, I identify the elements of the Kantian framework that Heidegger retains and appropriates for his project, as well as those elements that he rejects. In the former case, Heidegger takes up primarily Kant’s framework of a priori transcendental conditions that are to make empirical experience possible, which Heidegger reformulates in terms of the pre-understanding of being that makes possible the apprehension of entities. In the latter case, I isolate two primary criticisms that will serve as desiderata for the execution of Heidegger’s project, namely: that the categories have an excessively subjectivistic status, and that they are based solely on logical functions of judgement. The former constitutes a problem because the location of the categories on the subject side make s difficult their applicability to the objective realm, and lead Heidegger to reject both the quid juris form of posing the question as well as the results of the transcendental deduction in general. The latter, though closely connected, points to a different set of problems, and targets not the applicability claim but the exhaustiveness claim of the metaphysical deduction. In articulating a theory of categories based on logical functions of judgments, Kant’s resulting theory of possible objects of experience is limited merely to objects of explicit judgement, roughly the objects of the natural sciences, at the expense of other kinds of objects. Paradigmatic of these ‘other kinds of objects’, for Heidegger, are ready-to-hand entities, which are neither spatio-temporally individuated, nor fit into the Kantian conditions for what it would be to count as an object of possible experience. I argue that Heidegger develops his late Marburg project as a development of the Kantian-inspired framework of pre-understanding of being in a manner that responds to the two above problems. Specifically, Heidegger seeks to ground the understanding of being in temporal schemata rather than in logical functions of judgement, which is intended to provide both a wider range of possible objects and to provide a unified backdrop against which the subject can apprehend objects. I end with an assessment of Heidegger’s project, arguing that while it is ultimately unsuccessful in its aims, it nonetheless represents a philosophically interesting and innovative post-Kantian project that sheds exegetical light both on Heidegger’s middle period as well as on his later works. (shrink)