Prof. Lech J. Sitnik is a distinguished researcher and theorist known for developing groundbreaking theories on cumulative degradation of solids, cavitation erosion, fatigue impact of liquid streams, cumulative energy consumption in vehicles, and fluid filtration. His extensive research experience includes mathematical design of experiments, mathematical modeling, and the application of advanced methods such as artificial intelligence, fuzzy algebra, genetic algorithms, and Monte Carlo methods. As a project leader, he has spearheaded numerous research initiatives both locally and within the EU, focusing on new technology development, patenting innovations, and implementing training programs. Additionally, Prof. Sitnik has conducted training in durability, reliability, vehicle diagnostics, and waste-to-fuel technologies, and has organized various international and national conferences. His teaching career spans multiple languages, including Polish, German, and English, reflecting his broad educational impact.