Given the question: Information: - Cambridge is a university city and the county town of Cambridgeshire, England, on the River Cam about north of London. At the United Kingdom Census 2011, its population was 123,867, including 24,488 students. - Ben Cheese (1955 21 January 2001) was a British engineer who worked on Sinclair's ZX Microdrives. Authors Ian Adamson and Richard Kennedy, in their book "Sinclair and the "Sunrise" Technology", write that "it seems only fair to note that it was the tenacity and imagination of R&D staffer Ben Cheese that got the product [i.e., the Microdrive] to the market". - John Mathieson is a Computer Science graduate who initially worked for Sinclair Research before going on to found Flare with fellow ex-Sinclair colleagues Martin Brennan and Ben Cheese . After working at Flare on the Flare 1 and its development into the Konix Multisystem , he went on to work for Atari developing the Atari Jaguar with Martin Brennan . John moved to California and worked on the Jaguar 2 which never saw the light of day . He led the development of the ill - fated NUON media processor at VM Labs . He moved to work for NVIDIA at the end of 2001 . As Director of Mobile Systems Architecture at NVIDIA Corp. he led the system architecture team for three generations of the Tegra applications processor . - Sir Clive Marles Sinclair (born 30 July 1940) is an English entrepreneur and inventor, most commonly known for his work in consumer electronics in the late 1970s and early 1980s. - Sinclair Research Ltd is a British consumer electronics company founded by Clive Sinclair in Cambridge. It was originally incorporated in 1973 as Westminster Mail Order Ltd, renamed Sinclair Instrument Ltd, then Science of Cambridge Ltd, then Sinclair Computers Ltd, and finally Sinclair Research Ltd. in 1975. It remained dormant until 1976, when it was activated with the intention of continuing Sinclair's commercial work from his earlier company Sinclair Radionics, and adopted the name Sinclair Research in 1981. - The ZX Microdrive is a magnetic tape data storage system launched in July 1983 by Sinclair Research for its ZX Spectrum home computer. It was proposed as a cheaper alternative to the floppy disk, but it suffered from poor reliability and slower speed. The Microdrive technology was later also used in the Sinclair QL and ICL One Per Desk personal computers. The minimum storage capacity of a Microdrive tape cartridge was 85 KB. After reading the paragraphs above, we are interested in knowing the entity with which 'john mathieson ' exhibits the relationship of 'occupation'. Find the answer from the choices below. Choices: - computer - engineer - entrepreneur - inventor - research - science - united kingdom
The answer is:
engineer