Gilles Deleuze and Michel Foucault shared a philosophical friendship, so the sentiment goes. However, despite numerous mutual references, laudatory reviews, and forewords written for each other, there have been hardly any works that address the philosophical content of this relationship. Jonas Osswald for the first time demonstrates the fundamental and continuous dialogical intertwining of Deleuze's and Foucault's philosophies, from early transcendental philosophical considerations to the question of power, where the outlines of two complexly intertwined power philosophies emerge, which, despite all their differences and tensions, ultimately converge in a heterogeneous concept of power production.