About

Sergio A. Castaneda holds a J.D. from UCLA School of Law and is admitted to practice in California, the U.S. District Court for the Central District of California, and the Ninth Circuit Court of Appeals. With more than 25 years of experience, he is committed to giving a voice to those who are often overlooked in the legal system. His first landmark victory came when he represented a single mother who had been failed by her previous attorney in a divorce arbitration. By pursuing a trial de novo, he not only overturned a $50,000 arbitration award but also secured reimbursement of her attorneys’ fees. That success cemented his belief that meticulous preparation and unwavering advocacy deliver real results. Today, Sergio applies those same principles to juvenile and adult criminal defense, developing tailored strategies to meet each client’s unique needs. At Castaneda | Gaspari, APC, he ensures that every client benefits from clear communication, personalized attention, and the highest standard of representation.