Question: What Swiss American helped design the Ford Sierra

full_context: Document 1: Bob Switzer: Robert C. Switzer, usually known as Bob Switzer, (19 May 1914 – 20 August 1997) was an American inventor, businessman and environmentalist. Bob was co-inventor of the first black light fluorescent paint along with his brother Joseph Switzer and the inventor of the Magnaglo process for nondestructive flaw-detection in machined parts. The brothers founded the Day-Glo Color Corp. in 1946 to develop and manufacture fluorescent paints, pigments and other products.
Document 2: General Motors: General Motors Company, commonly known as GM, is an American multinational corporation headquartered in Detroit, Michigan, that designs, manufactures, markets, and distributes vehicles and vehicle parts, and sells financial services. With global headquarters at the Renaissance Center in Detroit, Michigan, United States, GM manufactures cars and trucks in 35 countries. In 2008, 8.35 million GM cars and trucks were sold globally under various brands. GM reached the milestone of selling 10 million vehicles in 2016. Current auto brands are Buick, Cadillac, Chevrolet, GMC, Holden, and Wuling. Former GM automotive brands include McLaughlin, Oakland, Oldsmobile, Pontiac, Hummer, Saab, Saturn, as well as Vauxhall, and Opel, which were bought by Groupe PSA in 2017.
Document 3: Ford CDW27 platform: The Ford CDW27 platform was Ford's midsize car automobile platform from 1993 to 2006, It was co-designed by Ford and Mazda and was designed to be used as its 'World Car' platform. The platform was developed over six years and at a huge expense totalling $6 billion, but was expected to save 25% compared to developing separate models for Europe and North America The design is based on Mazda's GE platform, used by the Mazda Cronos/626
Document 4: MK Indy: The MK Indy is a Lotus 7 replica based on the Locost principle, built by MK Sportscars in Maltby, Rotherham. The Indy has an independent rear suspension using the differential and drive shafts from a Ford Sierra. It uses many other components from the Sierra, including front hubs and steering rack. Further, it can be fitted with any of a variety of engines, the most popular choices being the Ford Pinto engine from the Sierra for its ease and cheapness or a large motorcycle engine for its light weight and high rpm.
Document 5: Ford Sierra: The Ford Sierra is a mid-size car or large family car that was built by Ford Europe from 1982 to 1993. It was designed by Uwe Bahnsen, Robert Lutz and Patrick le Quément. The code used during development was "Project Toni" Its name came from the Spanish word for mountain range.
Document 6: Bob Lutz (tennis): Robert Lutz (born August 29, 1947) is a former amateur and professional tennis player of the 1960s and 1970s. He and his longtime partner Stan Smith were one of the best doubles teams of all time. Bud Collins ranked Lutz as World No. 7 in 1972. Between 1967 and 1977 he was ranked among the top-10 American players 8 times, with his highest ranking being No. 5 in both 1968 and 1970.
Document 7: Tony Posawatz: Tony Posawatz (born 1960) is an American automotive engineer, best known for his work on the Chevrolet Volt, and in 2012 becoming chief executive of Fisker Automotive. He is a State of Michigan licensed Professional Engineer (P.E.).
Document 8: Tata Sierra: The Tata Sierra, and later Tata Sierra Turbo, was a three-door sport utility vehicle produced by Tata Motors of India. It was based on the Tata TL. It was the first automobile to be designed and produced in India. The vehicle also forms the basis for DC Design's Arya Concept vehicle. The Sierra was initially powered by a 1948 cc naturally aspirated engine. Tata Motors later launched Sierra Turbo, which was powered by turbocharged version of 1948cc diesel engine. Sierra Turbo was sported plastic flared wheel arches, headlight from Tata Estate, rear wipers and extra tail lamps on bumper. Tata launched Sierra Turbo 4x4 before pulling the plug.
Document 9: Ford GT: The Ford GT is an American mid-engine two-seater sports car manufactured and marketed by Ford for model year 2005 in conjunction with the company's 2003 centenary — and again in redesigned form for model year 2017.
Document 10: Ford Type 9 transmission: Type 9 (also, Type N, T9, or T-9) is a gearbox from Ford that was used in Ford Capri 1.6, 2.0 1984 onwards, Capri 2.8 1983 onwards, Ford Sierra 1.6, 1.8, 2.0, Sierra XR4i,Sierra XR4x4 2.8 and the Scorpio 4x4 as well as the US market Merkur XR4Ti and Merkur Scorpio.
Document 11: Bob Lutz (businessman): Robert Anthony Lutz (born February 12, 1932) is a Swiss American automotive executive and a former Vice Chairman of General Motors.
Document 12: Robert Mercer (businessman): Robert Leroy Mercer (born July 11, 1946), better known as Bob Mercer, is an American computer scientist, a developer in early artificial intelligence, and co-CEO of Renaissance Technologies, a successful hedge fund.
Document 13: Ford Sierra RS Cosworth: The Ford Sierra RS Cosworth is a high-performance version of the Ford Sierra that was built by Ford Europe from 1986 to 1992. It was the result of a Ford Motorsport project with the purpose of producing an outright winner for Group A racing in Europe.
Document 14: John Beltz: John Beltz was Oldsmobile's chief engineer in 1964 and one of the prime movers of the Oldsmobile Toronado and 442 project. Beltz was promoted to Oldsmobile general manager at age 43 in 1969 when Harold N. Metzel retired. Beltz died in May 1972 from cancer at the age of 46. He was revered in the automotive industry as a visionary ahead of his time. Throughout his career, Beltz became known as much for his engineering brilliance as his charisma, his always clever sense of humor and impeccable taste in cars. According to legend, John Beltz and his staff led Oldsmobile through undoubtedly its best years and the Oldsmobiles from 1949 to 72 define Olds as the Rocket division of GM. It is said that during his time at the helm of Oldsmobile, Beltz represented Michigan and the auto industry in its purest form, when cars were king and the auto industry worker, both blue and white-collar, was the lifeblood of the state.
Document 15: Ford P100: The Ford P100 is a car-based pickup truck that was built by Ford from 1971 to 1993, initially in South Africa, and later Portugal. It was based on medium-sized Ford passenger cars, originally the Ford Cortina and from 1988 the Ford Sierra. Initially marketed as the Ford Cortina Pickup, the P100 name was adopted in 1982. The P-100 name had previously been used on a small North American panel van in the 1960s.
ground_truth: Robert Anthony Lutz