Tomasz Ściężor, PhD, DSc, Assistant Professor at the Faculty of Environmental and Power Engineering at the Cracow University of Technology. Born on 6 July 1964 in Cracow. In 1988, he received his master's degree in physics at the Faculty of Mathematics and Physics of the Jagiellonian University in Cracow. In 1995, he he received his PhD in technical sciences at the Faculty of Materials Science and Metallurgy of the AGH University of Science and Technology in Cracow. In September 2018, he received his DSc degree at the Cracow University of Technology (CUT) based on the monograph "Natural and anthropogenic factors of the night sky glow." Since 2003, he is the pioneer researcher on the phenomenon of light pollution in Poland. He is also the founder of the CUT Light Pollution Monitoring Laboratory and a network of light pollution monitoring stations in southern Poland. In September 2019, he was the organiser of the First International Conference on Light Pollution EALPO 2019 at the CUT.