Dr.-Ing. Johann F. Gülich (1939), MS in Mechanical Engineering from the Technical University Hannover (Germany), PhD from the Technical University Darmstadt. Professional curriculum: Project engineer in the nuclear power plant division of Siemens, Erlangen, Germany. Since 1966 with Sulzer Winterthur (Switzerland): Starting as development engineer in the nuclear reactor design; subsequently for 10 years head of the team "Thermo-hydraulics" responsible for the thermal and hydraulic design of steam generators and heat exchangers for nuclear power stations; finally head of the team responsible for the hydraulic development of centrifugal pumps, during several years also for the mechanical development of centrifugal pumps. Pump consultant since retirement in 2001. JF Gülich is author of numerous journal publications and holds several patents on centrifugal pumps and steam generators for nuclear power plants.