|Coaching career (HC unless noted)|
|Head coaching record|
College Football Data Warehouse
|Accomplishments and honors|
1 WAC (1992)
Wagner, a longtime assistant under Dick Tomey at Hawaii, took over the head coaching position when Tomey left to take the Arizona Wildcats head coaching job. While head coach at Hawaii, Wagner led the Rainbow Warriors to their first WAC title in 1992. During most of Wagner's tenure at Hawaii, his offensive coordinator was current Georgia Tech head coach Paul Johnson. Despite Wagner's overall success, he was let go after a 4–8 season in 1995, and replaced by former Bill Walsh assistant, Fred von Appen.
Wagner was out of coaching for a few years, but after the 1997 season ended, Wagner agreed to take over the defensive coordinator position for TCU under new coach Dennis Franchione. On a Monday morning, five minutes after receiving information for a flight to Dallas, his old mentor Dick Tomey called, asking if he wanted to take over an assistant position on his staff. Wagner gladly accepted and ended up coaching inside linebackers for Arizona.
Wagner is a graduate of Newark High School, and subsequently attended Wittenberg University in Springfield, OH.
Head coaching record 
|Hawaii Rainbow Warriors (Western Athletic Conference) (1987–1995)|
|National championship Conference title Conference division title|
|#Rankings from final Coaches' Poll.
°Rankings from final AP Poll.