During his 25-year association with the original Cleveland Browns and the Baltimore Ravens, he worked in the ticket office and in the public relations and marketing divisions.
[1] In 1969, David's mother wed Cleveland Browns owner and advertising executive Art Modell.
[2] From the franchise's arrival in Baltimore as the re-christened "Ravens" in 1996, to the sale of the team to Steve Bisciotti in 2003, Modell served as President.
Since the change of principal ownership, Modell, like his late father Art, maintained a position with the team as a consultant, and kept a low public profile.
Modell served as chairman for 3ality Digital, Inc., which provides 3D entertainment solutions from image captures through broadcast, in any viewing platform, for various consumers.