Mike Tomlin opens up about former mentor Jon Gruden's resignation from Raiders: 'It's a sad' situation | CBS Sports Headlines Mike Tomlin opens up about former mentor Jon Gruden's resignation from Raiders: 'It's a sad' situation Tomlin spent four years working for Gruden in Tampa Bay ESN FeedsThis post was … Continue reading Mike Tomlin opens up about former mentor Jon Gruden's resignation from Raiders: 'It's a sad' situation