J.J started working for Golden Mastering in 1998. He studied sound engineering at S.A.E -School of audio Engineering in London, UK. After graduating , he was offered a job as Technical Supervisor at SAE while freelancing as a recording / mixing engineer at the now defunct Pathway Studios in North London. 

Notable Mastering Credits
KELLEY STOLTZ- "Circular Sounds"
NICK FREITAS - "Shoo Be Doo Wop"
RUBIES- "Explode From The Center"
THE PAPERCUTS- "Can't Go Back"
CALEXICO- Feast of Wire
VETIVER - "To Find Me Gone"
THE NEW PORNOGRAPHERS- Challengers
DEVENDRA BANHART- Cripple Crow
LAVENDER DIAMOND - Imagine Our Love
THE EXTRA GLENNS - "Martial Arts  Weekend"
GRANFALOON BUS -  "Exploded View" 
THE CHAMBER STRINGS - "Month of Sundays" - Bobsled Records
THE SORTS - "Contemporary Music" - Slowdime Records
OLO "Steve christy EP"
A GREAT DIVIDE - Frenetic Records
ALL TRANSISTOR - Ojet Records
CADALLACA - Kill Rock Stars
SLUMBER PARTY - Kill Rock Stars
MICK CLARK - Burnside Records
FRISBIE - Hear Diagonally  Records
JUSTIN ROBERTS - "Yellow Bus" - Hear Diagonally Records
TRACY  SPUEHLER - "631" - Hear Diagonally Records
GENE DEFCON - "Come Party with me 2000" - K Records
THE ENKINDELS - Initial Records
THE IMPOSSIBLES - X Records
UNPROVOKED MOOSE ATTACK - Morphius Records
ELENI MANDELL - "Thrill" , "Snake  Bite" , "Country For True Lovers" , "Afternoon"  Spacebaby / Zedtone records
ORANGE DRIVE - Big Top Records
DEMONS - Gearhead Records
THE NATIONAL ACROBAT - Status Records
ROBBIE DEL MAR - Magnetic Records
PORT VALE - Ojet Records
THE FORTY ONE RIVERS -Kalliste Records
QUAZAR AND THE BAMBOOZLED - Dot Dash Records
THE FREELOADERS - Sunrise Records
SWEARING AT MOTORISTS - Secretly Canadian
A HUNDRED THOUSAND - Three Sphears 
JAGKAZ - "Akrasia"
RAGING SLAB - Tee Pee Records
JEFF HANSON - Kill Rock Stars
EMILY EASTERLY
THE ORANGES BAND - Lookout Records
SUPER RIDER
ILL LIT
THE CASUAL DOTS- Kill Rock Stars
THE WASHDOWN - Lookout Records