1. Deputy Head of the Main Investigative Department of the StateBureau of Investigation (Kyiv, Ukraine).
2. Director of the Interdepartmental Research Center for Combating Organized Crime under the National Security and Defense Council of Ukraine (Kyiv, Ukraine).
3. Head of the Department, Interdepartmental Research Center for Combating Organized Crime under the National Security and Defense Council of Ukraine (Kyiv, Ukraine).
4. Head of the Department of Criminal Law and Criminology, Donetsk State University of Internal Affairs (Kropivnitskiy, Ukraine).
5. Dean of the Faculty of Humanities and Economics at Berdyansk State Pedagogical University (Kyiv, Ukraine).