Viktor Portel is a director and head of film production at the non-profit organization Post Bellum. The Investigator is his feature debut. He participated as a creator and story editor in the exhibition Memory of the Nation in the underground of the former Stalin monument in Prague (2018) and the projection Memory of the Nation entitled "1989" for the 30th anniversary of the Velvet Revolution. He is also a curator of interactive exhibitions at the Memory of Nations Institute. As a trainer, he helps to develop documentation projects in places where remembering is not as easy as it is in Czech Republic (Burma, Cuba, Ukraine). He is the author and director of many episodes of the Czech TV series Stories of the 20th Century. His film Havel Heart (2013) won the first prize of the Czech Press Photo in the Online news and reportage category. Viktor graduated from the Department of Documentary Production at FAMU.

Criminal investigator and author Vladimir Dzuro, Police Commissioner ret. used to work (between 1983 and 1995), as a criminal investigator for the Police of the Czech Republic. Initially he worked at the Homicide Squad in Prague and later at the Interpol (National Central Bureau) in Prague. In 1994, Vladimir actively participated in the work of the United Nations peacekeeping forces in the former Yugoslavia (UNPROFOR). Since April 1995 (for almost 10 years), Vladimir held the position of an investigator at the Office of the Prosecutor in the International Criminal Tribunal for the former Yugoslavia (ICTY) in The Hague, Holland. Vladimir, until March 2023, worked as the Chief of the Headquarters Investigation Unit at the United Nations Office of Internal Oversight Services in New York. Currently, Vladimir lectures NATO Military Police investigators on various aspects of war crime investigations.