Heideggerian ontico-ontological difference as the 'matter' of philosophy, to its Derridian response, to the way in which Deleuze takes it up, extends it, and provides a new interpretation of it; difference as the pivotal concept around which philosophy can be constructed as a non-dogmatic, non-representational ontology; Bergson and the later Merleau-Ponty.
Truth and Genesis: Philosophy As Differential Ontology (Studies in Continental Thought).(Indiana University Press, 2004).
Thinking with Heidegger: Displacements, (Indiana University Press, 2003).
'Toward a Phenomenology of Difference?', Research in Phenomenology xxx, 2000.