Dipl.-Ing. agr. Johannes Prügl: Owner of the Prügl Soil Institute, engineering office for soil and vegetation technology, Au i.d. Hallertau. Field and laboratory investigations, substrate development, consulting and quality monitoring for GaLa construction. Soil science construction supervision. Studied horticultural sciences at the Technical University of Munich-Weihenstephan, was operations manager, laboratory manager and authorized signatory at a Munich soil preparation company for 14 years. Self-employed since 2000. Trainer of GaLaBau experts.