Prof. Dr. Jacek S. Leszczyński is a Full Professor with the Department of Thermal and Fluid Machines, Faculty of Energy and Fuels, AGH University of Science and Technology Stanisław Staszic in Krakow, Poland. He is an active member and expert of many scientific organizations, such as the National Centre of Research and Development, IEEE, and the EU. He has worked for over thirty years in project grants, industrial applications, and academic programs that concern the following main scientific activities: modelling of complex systems and energy efficiency. He has been the principal investigator and research coordinator on applied research and development projects at around 35 M€ including three successful EU project grants. His scientific activity includes modeling techniques of complex systems involving compressed air systems, CAES, energy efficiency, energy harvesting systems and devices, mechanics/flows of granular materials, fractional derivatives, population balance and DEM techniques, soft magnetic materials and inductive elements operating in high-frequency bandwidth, as well as the management of R&D groups oriented industrially.