A 2002 Metropolitan Opera National Semi-Finalist, Granner trained at the University of Missouri–Kansas City conservatory where he graduated in vocal performance in 1996. He made his operatic debut in 1998 as Ferrando in the Wolf Trap Opera Company production of Così fan tutte. Other notable performances include Nemorino Lyric Opera of Kansas City 2003,Mr. Owen, Celestino Medeiros/Lowell in the world premiere of Anton Coppola's opera Sacco and Vanzetti at Opera Tampa (2001), and Remus in the Opera Theatre of Saint Louis production of Scott Joplin's Treemonisha (2000).
