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.
Kingda Ka The ride was closed for three months for repairs and reopened on August 21, 2009. On August 27, 2011, Kingda Ka suffered unspecified damage shortly before Hurricane Irene; that same day, Six Flags Great Adventure did not open due to the approaching hurricane. While it is unknown whether additional damage occurred due to the storm, the coaster was damaged to the extent that it could not run before Irene. Kingda Ka remained closed until the start of the 2012 operating season on April 5. Shortly before 5:00 pm on July 26, 2012, a young boy was sent to the hospital