The second book in Marcopoulos' portraits book series takes a look at the musician, guitarist, rapper, producer, and actor Adam Keefe Horovitz (South Orange, NJ, 1966) also known as Ad Rock, one of the members of the pioneering hip-hop group, the Beastie Boys, together with Michael "Mike D" Diamond, Adam "MCA" Yauch and dj Michael "Mix Master Mike" Schwartz.

Ad Rock portraits the life and interaction Marcopoulos had throughout the years with the band and in particular with Adam, both as a friend and insider with his camera capturing moments on and off stage with his spontaneous and unplanned style. The book is a great addition to the earlier 2001 publication Pass the Mic: "Beastie Boys" 1991-1996 bringing out fresh and unseen shots while at the same time preserving the raw energy and beauty of the earlier book.