Please answer the following question: What type of details about kenny roberts can be gathered from the following bio? Bio: kenneth leroy roberts -lrb- born in modesto , california -rrb- is an american former professional motorcycle racer and racing team owner . in 1978 , he became the first american to win a grand prix motorcycle racing world championship . he was also a two-time winner of the a.m.a. grand national championship . roberts is one of only four riders in american motorcyclist association -lrb- ama -rrb- racing history to win the ama grand slam , representing grand national wins at a mile , half-mile , short-track , tt steeplechase and road race events . roberts left his mark on grand prix motorcycle racing as a world championship winning rider , an advocate for increased safety standards in racing , and as a racing team owner and a motorcycle engine and chassis constructor . his dirt track-based riding style changed the way grand prix motorcycles were ridden . roberts ' proposal to create a rival motorcycle championship in 1979 broke the federation internationale de motocyclisme -lrb- fim -rrb- hegemony and increased the political clout of grand prix racers , which subsequently led to improved safety standards and a new era of professionalism in the sport . in 2000 , roberts was named a grand prix legend by the fim .
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