Sirena Castillo is a litigation partner in the investigations and white collar defense practice and is resident in the Los Angeles office. Sirena’s practice focuses on representing banks and other corporate entities during criminal investigations and complex civil litigation, with an emphasis on representing foreign entities in U.S. government investigations. She has represented a wide variety of clients in state and federal courts, including clients in the healthcare, banking and insurance industries. Her white collar defense practice includes the representation of banks and corporations at all phases of government investigations, including responding to grand jury subpoenas and civil investigative demands. Sirena also conducts internal investigations, both internationally and domestically, for banks and corporate entities in response to allegations of misconduct or to government inquiries. She has experience defending entities in a wide variety of white collar criminal matters, regulatory enforcement matters, internal investigations, False Claims Act actions, nationwide consumer class actions, complex contract disputes and unfair competition actions.
Sirena has spent significant time on pro bono work, including successfully representing a class of abused, abandoned or neglected children in California seeking Special Immigrant Juvenile Status (SIJS) protections, and representing asylees before USCIS and in Immigration Court.
Prior to joining Manatt, Sirena was an import policy analyst with the Department of Commerce’s International Trade Administration (ITA), where, as a part of the Antidumping and Countervailing Duty Petition Counseling and Analysis Unit, she advised U.S. industries and assisted in the initiation of petitions to address violations of U.S. unfair trade laws. Sirena also served as a policy advisor to the acting assistant secretary for Import Administration, the head of the ITA’s lead unit on enforcing trade laws and agreements regarding imports. She also served as a judicial extern to the Hon. Dale S. Fischer in the U.S. District Court, Central District of California.