He played in AFL for the league champion Oakland Raiders in the second AFL-NFL World Championship Game, held after the 1967 season.

After his playing career ended, Herock became a player personnel executive in the NFL with the Raiders, the Tampa Bay Buccaneers, and the Atlanta Falcons.

He is known for trading Brett Favre from the Falcons to the Green Bay Packers at the urging of head coach Jerry Glanville.

[1] Herock spent seven seasons as the Raiders' personnel director, and was credited with helping build their Super Bowl XI championship team.

[2] Coach Howard Schnellenberger then made Herock his first hire, offering him the same position with the USFL Washington Federals.