Jerzy Perzanowski

Jerzy Perzanowski (April 23, 1943 in Aix-les-Bains – May 17, 2009 in Bydgoszcz), was a Polish logician and ontologist, Professor of Logic to the University of Toruń (Poland) from 1992 to 2004. Founder of the Polish review ''Logic and Logical Philosophy'', his main contributions are to the development of modal logic, paraconsistent logic and ontology. Provided by Wikipedia