Former NFL coach Jon Gruden is back in football as a partner ... Titans coach Brian Callahan's father Bill was offensive coordinator for the Raiders under Gruden and later was promoted to coach.

Former NFL head coach and current Barstool Sports personality Jon Gruden paid the St. Louis Cardinals a visit last week.

Jon Gruden, who served as coach of three NFL teams, has become a part-owner and advisor of the Nashville Kats in the Arena ...