Who was the first person inducted in the nfl hall of fame?

That is Cal Hubbard who played offensive tackle and end in the NFL with the Giants, Packers, and Pirates (now Steelers) from 1927-1936 and was elected to the Pro Football Hall of Fame in 1963. After his retirement he became an umpire in the American League and is credited with developing the logic behind the four man umpire crew and the positions each umpire should be in based on the play that was occuring. After his retirement from active umpiring he was the American League's Supervisor of umpires. He was elected to the Baseball Hall of Fame in 1976. Through the 2008 season Hubbard is the only man to be in both the Baseball Hall of Fame and the Pro Football Hall of Fame.