Question: What is the nationality of the designer of the SooperDooperLoope?

Context paragraphs:
SooperDooperLooper: The SooperDooperLooper is a looping roller coaster at Hersheypark.  It was designed as a terrain coaster by Werner Stengel, and built by Anton Schwarzkopf.

Henri Farman: Henri Farman (26 May 1874 – 17 July 1958) was an Anglo-French aviator and aircraft designer and manufacturer with his brother Maurice Farman.  His family was British and he took French nationality in 1937.

Pierre Kleykamp: Pierre Armand Kleykamp (January 30, 1921 - June 10, 1984) was a Modern furniture, interior, graphic, textile, product designer and teacher.  Born in Belgium of Dutch nationality, he became a U.S. citizen in 1954.  His clients included KLM (Royal Dutch Airlines), Holland-American Lines, Aetna Life Insurance, the United Nations.  He supplied furniture to the Goed Wonen Groep and crafted several pieces for the interior of Schiphol Airport's International Departure Hall.

Savitri Khanolkar: Savitri Khanolkar, born Eve Yvonne Maday de Maros, on July 20, 1913 – 1990 in Neuchâtel, Switzerland.  She was later known as Savitri Bai, the name she was given after she married an Indian, became a Hindu and took Indian nationality.  She is the designer of India's highest gallantry award, the Param Vir Chakra.

John Pendray: John Pendray, (born 12 July 1937 in the city of London, England), is a Franco-British painter.  Graduated from the Saint Martin School of Art and the University of London Institute of Pedagogy, he taught painting, sculpture and ceramics during 11 years.  Then he moved to Marseille, France, where he first worked as an independent designer.  He's a professional painter since 1990.  In 2000 he obtained French nationality and, in 2001 he was appointed Ofﬁcial Painter of the French Navy.

Werner Stengel: Werner Stengel (born 22 August 1936 in Bochum) is a German roller coaster designer and engineer.  Stengel is the founder of Stengel Engineering, also known as Ingenieur Büro Stengel GmbH (or Ingenieur Buero Stengel GmbH).

Supporting paragraphs: SooperDooperLooper Werner Stengel
Answer: German