Marrow had been a graduate assistant with Nebraska under head coach Bo Pelini, where he looked over the tight ends unit and eventually helped recruit when associate head coach Barney Cotton was unable to travel while recovering from surgery.
Before that, he served as a tight ends coordinator for two NFL Europe teams, the University of Toledo, and the Omaha Night Hawks, and was also a head coach for Springfield High School in Holland, OH. He played in the NFL from 1992-1995, and then overseas until 1998. He even played in the lone season of the XFL begun by WWE’s Vince McMahon in 2001.