Marian Kupczynski is a theoretical physicist. He holds a M.Sc. degree in Physics (1967) and Ph.D, in Theoretical Physics from Warsaw University (1971). From 1967 to 1978, he worked full-time at the Institute for Theoretical Physics of Warsaw University. In 1978 he was sent by the Polish Ministry of Higher Education to teach in Morocco on unpaid leave of absence. There, he held professorial positions at École Hassania d’Ingénieurs in Casablanca and at l’École Normale Supérieure in Rabat. In 1986, he emigrated to Canada, where he worked and taught for many years at Ottawa University and at the University of Quebec. After retiring, he continues his research as an adjunct professor in the Department of Computer Science and Engineering at the University of Quebec in Outaouais (UQO). His research interests include the theory of Lee groups and their representations, elementary particle physics, statistical analysis of experimental data and stochastic processes. For several years, his main field of research has been the foundations of quantum mechanics, where he made substantial contributions to the understanding of the meaning of the Bell inequalities and of their violation. In particular, he has recently explained that closing the freedom of choice loophole cannot close the theoretical contextuality loophole, thus the violation of these inequalities in Bell tests proves neither the nonlocality of nature nor the completeness of quantum mechanics.