Dr. Pavol Liptai is an Associate Profesor at the Istitute of Recycling Technologies, Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice. He received his Engineering degree from the Faculty of Mechanical Engineering, Department of Process and Environmental Engineering, Technical University of Kosice in 2005 and obtained his Ph.D. from the same faculty in 2011. His research interests include technological and material innovations, the elemental composition of materials, recycling technologies, the utilization of recycled materials, measurement techniques for physical parameters, the circular economy, and sustainable development.