We know that Helmuth Plessner complained about his anthropological magnum opus, published in 1928, being overshadowed by Heidegger from the beginning. When the latter, in turn, responded to Plessner, for example to his preface to Stufen , it was always anonymously; Heidegger never actually mentioned Plessner in any publication. Plessner on the other hand emphasized that he had developed his concept without any knowledge of Sein und Zeit , even though since 1924, he had shown strong interest in the yet-unknown colleague’s work. Thus, it appeared to the public that they philosophised independently of one another. In fact, the situation is much more complicated. This paper tries, above all, to identify the sources of the peculiar discomfort caused on both sides by the work of the respective other, as well as to delineate the philosophical effects. Notably in Heidegger’s case, not enough is known about this. Heidegger starts out, in the 1920’s, cultivating a strong anti-anthropological affect; however, after his triumphal success, both with his publication and in the institutional field, in 1927/1928, he finds himself in an orientation crisis; it is from this point onwards that traces of Plessner’s anthropology can be found in his thinking. Ultimately, Plessner will prove a serious source of irritation as well as of inspiration for Heidegger. Additionally, from a systematic point of view, the present text retraces the main points of Plessner’s critique (subjectivity, disembodiedness of fundamental ontology). The investigation makes use of a broader corpus of text than was available to Plessner and Heidegger’s contemporaries, and concentrates on two questions: Did Plessner understand his opponent? Is he able to raise valid objections? It becomes obvious that Plessner is right in complaining about disembodiedness (even though his own Leib philosophy remains conceptually diffuse), while some differentiation is advisable concerning the subjectivism charge.