Professor at the University of Silesia in Katowice. His research interests focus on the origins, development, change, diversification, and division of language in general, with particular emphasis on syntax. He studies mainly Indo-European languages compared to representatives of other language families (such as Khamito-Semitic, Austronesian, Sino-Tibetan, Quechuan, Thai). In addition to research on the history of language, typology of world languages and contrastive studies, he also deals with broadly understood identity, with the main emphasis on language, culture and religion.