Debuttò come tecnico del suono nei primi album dei Black Sabbath, dove era impegnato anche come tastierista. Successivamente produsse Strawbs, Pat Travers, The Tourists, Judas Priest, Kix, Krokus, Def Leppard, Rough Cutt, Nantucket, Doc Holliday, Whitford-St. Holmes, Cobra, Y&T, Loverboy, Urgent, Jetboy, The Works e Ashes & Diamonds.
Tecnico del suono Black Sabbath 1970 - Black Sabbath 1970 - Paranoid 1971 - Master of Reality 1972 - Black Sabbath, Vol. 4 1973 - Sabbath Bloody Sabbath
Produttore discografico Strawbs 1973 - Bursting at the Seams 1974 - Ghosts 1974 - Hero & Heroine 1975 - Nomadness
Pat Travers 1978 - Go for What You Know
The Tourists 1979 - Reality Effect 1980 - Luminous Basement
Judas Priest 1979 - Unleashed in the East 1980 - British Steel 1981 - Point of Entry 1982 - Screaming for Vengeance 1984 - Defenders of the Faith 1986 - Turbo 1987 - Priest...Live! 1988 - Ram it Down 2009 - A Touch of Evil: Live 2016 - Battle Cry 2018 - Firepower
Nantucket 1980 - Long Way to the Top
Def Leppard 1980 - On Through the Night
Doc Holliday 1980 - Doc Holliday 1981 - Doc Holliday Rides Again
Kix 1981 - Kix
Whitford-St. Holmes 1981 - Whitford-St. Holmes
Cobra 1983 - First Strike
Krokus 1983 - Headhunter
Y&T 1984 - In Rock We Trust
Rough Cutt 1985 - Rough Cutt
Loverboy 1985 - Lovin' Every Minute of It
Urgent 1987 - Thinking Out Loud
Jetboy 1988 - Feel the Shake
The Works 1989 - From Out of Nowhere
Ashes & Diamonds 1993 - Heart of an angel
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