 Mersey married English lyricist Pam Sawyer in the early 1960s; they later divorced.From the early 1960s he was employed as an arranger and producer at Columbia Records, where he was responsible for records by singers such as Andy Williams, Barbra Streisand, Bobby Vinton, Dion, Johnny Mathis, Julie Andrews, Mel Tormé, Patti Page and Ray Peterson.In 1960, he conducted the orchestra in the song "Good Timin'", sung by Jimmy Jones.