Mariusz Krzysztofiński, graduated in history from the Jagiellonian University in Kraków. Doctor habilitated in the field of humanities in the discipline of history, employed as the chief specialist of the Branch Office of Historical Research of the Institute of National Remembrance in Rzeszów. His research interests include the history of communism in Poland in the 20th century, the history of the Latin Rite diocese of Przemyśl, with particular emphasis on the pontificate of Archbishop Ignacy Tokarczuk and the methods of functioning and structure of the apparatus of repression in the Polish People’s Republic. Author and editor of many scientific and popularization studies.