He studied composition and computer sound/music at University of Illinois at Urbana–Champaign under prolific musicians Ben Johnston, Herbert Brün, Salvatore Martirano and Scott Wyatt.
[1] After leaving Midway, Granner set up his own sound production studio CGMusic and produced music and sound for many video games, advertisements and pinball games.
From 2006 to 2011, Granner had retired from composing music for games, after he was finished with Stern / Steve Ritchie Productions' pinball, World Poker Tour.
[3] In April 2012, Granner began audio work with Spooky Cool Labs, a Chicago-based startup company developing social games for Facebook and mobile platforms.
He joined Spooky Cool, in-house, as Audio Director in October 2012.