1. Director of Koretsky Institute of State and Law of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
2. Department of Public Administration and Administrative Law of the Institute of State and Law V.M. Koretsky National Academy of Sciences of Ukraine, Kyiv, Ukraine.
3. Department of International and European Law, V. N. Karazin Kharkiv National University, School of Law. Department of International and European Law, Kharkiv, Ukraine.
4. Faculty No 1, Donetsk State University of Internal Affairs, Kropyvnytskiy, Ukraine.
5. Judge of the Svyatoshyn District Court, Kyiv, Ukraine.