Full Professor at SWPS University of Social Sciences and Humanities, Director of the Institute of Law, Full Professor at the University of Warsaw, gave lectures at universities in Lille 2, Poitiers, Geneva and Paris 1; member of the Central Commission for Degrees and Titles (2003-2016) and its secretary (2011-2016), member-correspondent of the Polish Academy of Sciences; barrister, legal advisor; editor-in-chief of the Territorial Self-Government monthly; author (or co-author) of 31 books about public law, including territorial sel-government, and its theoretical and historical bases, author of many projects of laws.