Berkowitz's departure became official Friday, although Ben Smith reports that it is still unclear if he was asked to leave or forced out. A source tells Smith that Berkowitz's deputy, Matt Moon, has also left the committee.
Berkowitz headed the RNC's research department, and had worked in a similar capacity during Rudy Giuliani's presidential campaign.
The RNC has lost or dismissed a number of staffers in the wake of recent spending scandals. Berkowitz's departure follows that of Chief of Staff Ken MacKay and Finance Director Rob Bickhart, among others.