Werner Stengel including Son of Beast, Millennium Force, Superman The Ride, Top Thrill Dragster, Kingda Ka, Dollywood's Mystery Mine, El Toro, Maverick and many others. In the 2004 Amusement Today Golden Ticket Awards list of the world's top 50 steel roller coasters, 72% have had direct involvement with Stengel Engineering. He received an honorary doctorate from Gothenburg University in 2005, for his "inexhaustible creativity in linking physics and design to the experience of the body in roller coasters and other rides." One of the most famous and highly regarded Stengel/Schwarzkopf rides is Lisebergbanan at Liseberg, a park situated in Gothenburg city, Sweden.
Six Flags Great Adventure at Six Flags Over Georgia and Six Flags Great America. In 2004, new harnesses were added to the Runaway Mine Train and the up-charge attraction erUPtion was added to the Boardwalk. In 2005, the park added the world's tallest coaster called Kingda Ka and also dismantled Viper. With the addition of Kingda Ka, the season pass holders entrance to the park was closed because Kingda Ka's footprint went right over it. A new children's play area called Balin's Jungleland was also added. In 2006, a wooden twister coaster called El Toro was added in the spot formerly occupied by Viper,