In 1973 after garnering several awards with the London Design & Art Directors Club, he was elected to the British D&AD Jury before moving to Los Angeles. Once in L.A. he continued designing for various famous artists including: Jon Lord, Jimmy Buffett, Bob Dylan, The Eagles, Dan Fogelberg, Carole King, Randy Newman, Pointer Sisters, T.Rex, Richard Pryor, Ringo Starr, Linda Ronstadt, Electric Light Orchestra, Bob Seger, Rod Stewart, Spinal Tap and James Taylor. Kosh has garnered seven Grammy nominations and won three for his work with Linda Ronstadt.