Aside from the Poznań University of Technology, he has also lectured at the Paris Dauphine University, École Centrale Paris, University of Catania, University of Osaka, Yokohama National University, University of Missouri-Columbia, Laval University in Quebec and a number of others. Since 1999 he has been the editor-in-chief of the European Journal of Operational Research . H  Słowiński's research is on the topic of using rough sets in decision analysis. He started this work in 1983 with the founder of the rough set concept, the late Zdzisław Pawlak, and continued with Salvatore Greco and Benedetto Matarazzo since the early 1990s. He organized the First International Workshop on Rough Set Theory and Applications that took place in Poznań in 1992. Since 2006 he has been a member of the Social Council to the Metropolitan Archbishop of Poznań; in 2006-2010 he was a board member of the Polish section of the Aid to the Church in Need organization. Słowiński has been decorated with the following awards and distinctions:   He holds honorary doctorates from three foreign universities: the Polytechnic Faulty of Mons (Belgium, 2000), Paris Dauphine University (France, 2001) and the Technical University of Crete in Chania (Greece, 2008).: He is also a Honorary Professor of the Nanjing University of Aeronautics and Astronautics (2018).