Career
In 1945-1946 he led the investigations on the site of the Nazi concentration camp Auschwitz-Birkenau. As an investigation judge he prepared the accusation act of the former camp commandant Rudolf Höß. From 1949 director of the Institute of Forensic Research in KrakóWest
Sehn died suddenly 1965 in Frankfurt.
In 1966 Institute of Forensic Research in Krakow was named after January Sehn. He was the cousin of Wanda Szczerba (1910–1998), who was married to engineer and technical director of Fablok Klemens Stefan Sielecki (1903–1980).
