The value of a high-ranking Securities and Exchange Commission lawyer was once again proven Monday as another senior attorney was scooped up by private practice.

C. Dabney O’Riordan, until recently the long-serving chief of the Division of Enforcement’s Asset Management Unit (AMU), has moved to Quinn Emanuel Urquhart & Sullivan. Resident in both Los Angeles and Washington, D.C., O’Riordan joins Quinn’s SEC enforcement defense practice.