  A pupil of von Wright, Hintikka had been stimulated by the latter’s proposals for the wide application of modal logic (see the next Section) and had come to appreciate the possibility of applying modal notions to the study of the logic of time before he learned of Prior’s sophisticated work (through reading Time and Modality, which he reviewed in 1958). Hintikka was perhaps the first to stress the importance of a semantical approach to the tenses. During the early 1960s, he travelled regularly between Helsinki and California and his ideas on tense influenced a number of logicians working in California, in particular Dana Scott.