 Like many other philosophers of the time, Hartmann rejected system building as the goal of philosophy, but he embraced a systematic and careful mode of philosophizing. He had a perennial suspicion of ultimate solutions. His open-ended dialogical attitude was not dogmatic, and he did not encourage students to adopt his positions on issues but to think for themselves about topics systematically. This attitude is especially evident in the recently published transcripts of his beloved “disputation circles” (Fischer and Hartung 2020). In his writing, he adopted a non-speculative, sober style of analysis. His language was clear, and his method was rigorous, almost pedantic, proceeding punctiliously step by step, without anticipating solutions or taking anything for granted. His writings are organized in such a way that the reader is held in check and feels unable to foresee the next step in the argumentation. Virtuosic expertise in the history of philosophy is displayed throughout his works.