Defensive end who played in the NFL from 1967 to 1979. He broke into the NFL as a 9th round pick of the Cleveland Browns in 1966.
He played college football at two schools: The University of Tennessee at Chattanooga, and Delta State University.
He made the Pro Bowl in 1969 and in 1972, as a member of the Cleveland Browns and New York Giants, respectively.
His father, Jack Gregory Sr, also played professional football.
He grew up in the same area as singer Bobbie Gentry.