O’Melveny & Myers on Monday announced four litigators as new managing partners in New York City and three California offices, while naming new leaders for its M&A, securities litigation, and white-collar practices.

Commercial litigator Dawn Sestito is taking the reins in the roughly 170-attorney Los Angeles office, the firm’s largest. Allen Burton, also a commercial litigator, is now at the helm in New York, O’Melveny’s second largest outpost.