The Tyrrell Racing Organisation was an auto racing team and Formula One constructor (race car maker). It was created by Ken Tyrrell. The team started racing in 1958 and started building its own cars in 1970. The team had its best success in the early 1970s. During that time, it won three drivers' championships and one constructors' championship with Jackie Stewart. The team never did as well again, but it kept winning races through the 1970s and into the early 1980s. It won its final win at Detroit in 1983. The team was bought by British American Tobacco in 1997. It finished its last season as Tyrrell in 1998.