Kenny Roberts is a retired American motorcycle racer, widely regarded as one of the greatest in the sport's history. Born on December 31, 1951, in Modesto, California, he became the first American to win a world championship in the 500cc class of motorcycle racing. Roberts achieved this feat in 1978 and went on to win two more championships in 1979 and 1980. Known for his innovative riding style and technical skills, Roberts played a significant role in popularizing motorcycle racing in the United States. He also contributed to the development of the Yamaha racing team, helping to enhance their competitive edge in the sport.