Jaakko Hintikka is an internationally renowned philosopher known as the main architect of game-theoretical semantics and of the interrogative approach to inquiry, as well as one of the architects of distributive normal forms, possible-worlds semantics, tree methods, infinitely deep logics, and present-day-theory of inductive generalization. Currently a Professor of Philosophy at Boston University, he is the author of more than thirty books and has received a number of honors, most recently the Rolf Schock Prize for Logic and Philosophy, for his pioneering contributions to the logical analysis