During his career, he has represented recording artists such as Prince, Juicy J, Tori Amos, Queens of the Stone Age, A Perfect Circle, Thirty Seconds to Mars, Saosin, Yellowcard, Three Days Grace, The Distillers, Ashes Divide, Collective Soul, Flyleaf, Vanessa Carlton, and comedians Paul Reiser, Kevin Pollak, Larry Miller, Bruce Bruce, Sheryl Underwood, and Chad Prather.
In 2004, Arthur announced a deal with Beverly Hills management company The Firm, Inc. Spivak told Billboard magazine that the merger was about "clout, access to information, cross-marketing potential and value to clients".
[3] In 2012, Spivak co-founded the production and management company Laff Mobb with Def Comedy Jam Producer Bob Sumner.
In 2012-14 they produced standup comedy specials for Showtime Networks entitled, Mark Viera, “Tales of a Nuyorican”, Roz G, “Ain’t Got Jokes, Got Problems, Red Grant, “Caught Red Handed” and Rudy Rush, “From Harlem To Hollywood.” They have also produced standup comedy specials for BET, Dish Network, Vubiquity, InDemand among many others.
Spivak re-entered the music business as the manager of Three 6 Mafia's Juicy J and his endeavors as a producer and entrepreneur.