He served as faculty member of Otis/Parsons Institute of Art and on the Board of Governors of the National Recording Academy. From approximately 1988-1993, Kosh was partner in the Los Angeles Design Studio, Kosh Brooks Design, with fellow Art Director Larry Brooks. Kosh's client roster has included Capitol Records, Columbia-TriStar, Walt Disney Studios, Walt Disney Classics, Fox Television, The Gurin Company, CNN, MCA, MGM, the NFL (he designed the Super Bowl XXI logo), Sony Records and Warner Bros. Records. In 2009, the British Post Office (Royal Mail) issued commemorative stamps recognising the Beatles and their album covers. Two of them were Kosh's: "Abbey Road" and "Let It Be".