MONKEYHEAD is headed by BULLETBOYS and MANDY MOORE guitarist Jason ''Hook' Grinstead. The guitarist's history spanned through Canadian act LOVE NOT LOST and a brief 1993 stint with KILLER DWARFS before relocating to Los Angeles to join Mick Sweda's post BULLETBOYS outfit BRAIN STEM BABIES. Later outfits that saw Hook in the ranks included NEW POP EDEN and RHINO PARTY.

Taking lead vocals for the eponymous Beau Hill produced 2001 album is Simon Davies.

Jason Hook joined FIVE FINGER DEATH PUNCH in January 2009.