Professor of Philosophy of Science and Formal Logic at the Institute of Philosophy and Sociology of the Polish Academy of Sciences. Main publications: Topics in Formal Methodology of Empirical Sciences, Ossolineum and Reidel Publ. Co., Wroclaw/Dordrecht, 1979; Theory of Logical Calculi, Kluwer Academic Publishers, Dordrecht, 1988; Teorie w nauce; wstep do logiki, metodologii i filozofii nauki Cz.I (Theories in Science; an Introduction to Logic, Methodology and Philosophy of Science, Part I), IFiS PAN, Warsaw 1991. Editor-in-chief of Studia Logica, an International Journal for Symbolic Logic; Editor-in-chief of Foundations of Science, Advisory editor of Erkenntnis and Poznan Studies in the Philosophy of the Sciences and the Humanities; Former President of the Polish Association for Logic and the Philosophy of Science; Member of the Steering Committee of FISP Federation Internationale des Societes de Philosophie; Chairman of the Committee for Philosophy of the Polish Academy of Sciences; Visiting Fellow of the Center for Philosophy of Science, University of Pittsburgh. Professor Ryszard Wojcicki participated (as the Head of the School) in The First, (Second and Third) Summer School for Theory of Knowledge.