Jan Sehn was born on 22 April 1909 in Tuszowy Maly. He was a Polish lawyer, a judge and a professor of Penal Law at the Jagiellonian University in Krakow, the director of the Forensic Institute in Krakow and the President of the Commission of Investigation for Nazi Crimes in Krakow. He was an investigation judge in many trials for war crimes, among which those of Amon Goeth, Rudolf Hoess and Joseph Buehler. He died on 12 December 1965 in Frankfurt while preparing the new Auschwitz trial. He is buried in the Rakowicki cemetery in Krakow. The Forensic insitute bears his name since 1966.
Filip Ganczak wrote a book about him and gave an interview in English: https://polishhistory.pl/jan-sehn-polands-forgotten-nazi-hunter/
Wikipedia: https://en.wikipedia.org/wiki/Jan_Sehn .
Text Dr D Cohen