At the age of fourteen, he discovered the electric guitar, playing in cover bands before being drafted into the West German Army.
When Mack came home following his military service, he learned that his parents had gotten rid of his music equipment, and he decided to seek work at a recording studio.
[2] At Musicland's first session in 1973, Mack assisted producer Tony Visconti in recording sessions for Marc Bolan and T. Rex for their album Zinc Alloy and the Hidden Riders of Tomorrow, and later assisted on the Rolling Stones' It's Only Rock 'n Roll and Black and Blue, Deep Purple's Stormbringer and Come Taste the Band, and Led Zeppelin's Presence.
[4][5] In 1998, Mack founded Nightjar, a company originally focused on producing and remastering music for surround sound formats.
In 1999, he transferred the company, which now produces content for multimedia, video, animation, and sound, to his sons Julian and Felix.