2002 - Assistent of Professor at Technical University of Košice, Faculty of Metallurgy, Department of Non-Ferrous Metals and Waste Treatment 2020 - Associate Professor at Technical University of Košice, Faculty of Materials, Metallurgy and Recycling, Institute of Recycling Technologies 2024 - Associate Professor at Technical University of Košice, Faculty of Minning, Ecollogy, Process Control and Geotechnologies, Institute of Earth Resources.