He has a doctoral on the biomechanics of volleyball and beach volleyball .
George ( Georgios ) Giatsis ( born 22 June 1968 ) is a Greek volleyball and beach volleyball coach .
George ( Georgios ) Giatsis has a doctoral on the biomechanics of volleyball and beach volleyball .
George ( Georgios ) Giatsis ( born 22 June 1968 ) is a Greek volleyball and beach volleyball coach .