Len Dawson

Leonard Ray Dawson was an American professional football quarterback who played in the National Football League (NFL) and American Football League (AFL) for 19 seasons, primarily with the Kansas City Chiefs franchise. After playing college football for the Purdue Boilermakers, Dawson began his NFL career in 1957, spending three seasons with the Pittsburgh Steelers and two with the Cleveland Browns. He left the NFL in 1962 to sign with the AFL's Chiefs, where he spent the last 14 seasons of his career, and rejoined the NFL after the AFL–NFL merger.