Coyne's first job was at Dick Charles Recording Inc. where he first met Lee Hulko. In 1978, he began working at Frankford/Wayne Mastering Labs specialising in dance and R&B throughout the 1980's. In 1989, he moved to The Hit Factory, establishing himself as an expert in hiphop and R&B. In 1994, he moved to Sterling Sound. In 1998, Coyne, Ted Jensen, Greg Calbi, Murat Aktar (Absolute Audio co-founder) and the UK based Metropolis Studios bought Sterling Sound from Lee Hulko.
Coyne won multiple Grammy Awards for his work on recordings, including Adele (3)’s "21" and "25", and Taylor Swift's "1989".