 While he was initially a substitute, Gibron developed into a strong lineman on Cleveland teams that won NFL championships in 1950, 1954 and 1955 behind an offensive attack that featured quarterback Otto Graham, end Dante Lavelli and tackle Lou Groza.He was named to the Pro Bowl, the NFL's all-star game, each year between 1952 and 1955.After short stints with the Philadelphia Eagles and the Bears, Gibron ended his playing career and got into coaching.