Prof. Dr. George Giatsis is a Professor at the Aristotle University of Thessaloniki, School of Physical Education and Sport Science, and an internationally recognized Greek volleyball and beach volleyball coach. He holds a PhD in the kinesiology of volleyball, specializing in spike biomechanics and vertical jump performance. He is also an expert in performance analysis and the development of performance benchmarks and key performance indicators in volleyball and beach volleyball research. An accredited FIVB Instructor, he has authored numerous scientific publications and participated in nearly 40 Erasmus+ mobility programs, delivering seminars worldwide for national federations. He has served for many years as head coach of top Greek teams, won 70+ medals as an athlete, and coached athletes to multiple championship titles.