Keith Alan Olsen was an American record producer and sound engineer, who worked with Magnum, Rick Springfield, Fleetwood Mac, Ozzy Osbourne, the Grateful Dead, Whitesnake, Pat Benatar, Heart, Santana, Saga, Foreigner, Scorpions, Journey, The Babys, Emerson, Lake & Palmer, Joe Walsh, 38 Special, and Eric Burdon & the Animals, among others. Wikipedia