From Entourage Wiki
The most grounded of Vince's friends, Eric does his best to keep Vince on track personally and professionally. Eric acts as Vince's manager, sometimes causing friction between these lifelong friends. Eric reads Vince's scripts for him, and knows his friend's next move depends on how well Eric can get a grasp of the Hollywood shuffle. Eric's advice to Vince also periodically angered Ari, who feared that Eric's advice may have steered Vince towards the wrong projects. The tensions between Ari and E boiled over after Vince got bumped from the Ramones biopic, eventually leading Eric to fire Vince Chase's first (and only) agent.
