There are those who say that the changes in the position of Jean-Paul Sartre from the publication of L'Être et le néant to the appearance of Critique de la raison dialectique constitute a “radical conversion”. Some attribute this conversion to the influence of Maurice Merleau-Ponty. Sartre has given support to this claim by acknowledging that Merleau-Ponty taught him politics and in doing so helped to move Sartre from the fierce individualism of his early period to the position which culminated in CRD, a position informed by a much greater appreciation for social entanglement. But what is not clear is that Merleau-Ponty's influence upon Sartre extended to Sartre's fundamental convictions, particularly to his fundamental ontological theses. Kwant tells us that Merleau-Ponty's objections to Sartre in the last days of his life indicate that he believed that Sartre had not altered his ontological views. Sartre has not commented upon that issue. It is of vital interest because Merleau-Ponty explicitly claimed in Les Aventures de la dialectique that Sartre's mistaken political views were a consequence of his mistaken ontological principles. Were this true and were it true that Sartre had not made significant alterations in his ontology, one would expect that Merleau-Ponty would have to have said that Sartre's political views in CRD were similarly mistaken. We know that he did make some comments to that effect but, since Merleau-Ponty's tragic death prevented the full articulation of his latest opinions, we cannot be certain.