Warrington's practice involves the representation of clients in both civil and criminal matters. These matters typically include government involvement or claimed violations of state and federal regulations or statutes. Thus, Warrington has represented clients in False Claims Act matters, claims brought by the Federal Trade Commission, employment discrimination cases involving a federal research facility, allegations of fraud and breach of contract brought against a client by a state, and allegations that a school board inappropriately spent bond monies in violation of California law.
Warrington has conducted criminal and civil investigations, both nationally and internationally, including FCPA and financial irregularity investigations in China, Japan and India. Warrington has handled and managed state and federal civil cases from the filing of complaints to discovery and trial. Since joining Orrick in 2008, Warrington has tried multiple civil and criminal cases.
From 1992 to 1996, Warrington was Assistant United States Attorney for the United States Attorney's Office, Central District of California, Criminal Division in Los Angeles.
Before joining Orrick, Warrington was a shareholder at Heller Ehrman.