1929 – 2015
Jaakko Hintikka (1929-2015) was a Finnish philosopher and logician who made foundational contributions to epistemic logic, game-theoretical semantics, and the philosophy of mathematics. He developed independence-friendly logic and advanced the 'interrogative model' of inquiry, reshaping how philosophers understand questioning, knowledge, and belief.
Founded epistemic logic with Knowledge and Belief (1962)
Developed game-theoretical semantics for formal languages
Created independence-friendly (IF) logic
Advanced the interrogative model of inquiry
Contributed to possible-worlds semantics and the philosophy of Wittgenstein