Professor of Institute of Law Sciences of Polish Academy of Sciences, professor of University of Warsaw, co-redactor of Criminology Archive magazine. Criminologist, researcher, author of publications about deviant behavior, crimes committed by foreigners and criminology policy. Lecturer of ‘The human rights’ and ‘Criminology’ in Institute of Social Preventions and Resocialisation of University of Warsaw. From eighteen years Expert of the Helsinki Foundation for Human Rights in a program Legal assistance to Refugees and Migrants . Author of many publications in field of refugees and migrants rights. Co-author of legal opinion about reforms in the Act on Foreigners, co-author of many appeals to administration authorities to stop violation of migrants rights.