Robert Jenns Rock is a Canadian musician, sound engineer, and record producer, best known for producing rock bands and music artists such as Metallica, the Tragically Hip, Aerosmith, the Cult, Bon Jovi, Mötley Crüe, 311, Our Lady Peace, Bryan Adams, the Offspring, Michael Bublé, Black Veil Brides, David Lee Roth, and Ron Sexsmith.