Larson O’Brien ADR Services


Larson O’Brien ADR Services provides parties with highly experienced and dedicated dispute resolution services in mediation, arbitration, and private trial settings. No longer constrained by the conflicts that arise in an AMLAW firm, Stephen G. Larson, a former US District Judge, and Robert C. O’Brien, a former senior US diplomat, are able to provide customized ADR services to sophisticated counsel and parties. While Larson and O’Brien spend a majority of their time representing clients in high stakes litigation, they are pleased to serve as arbitrators, private judges, and mediators in appropriate cases. Larson and O’Brien also conduct moot trial and appellate courts and provide pre-trial or hearing advice to counsel as they prepare for trial.

Judge Stephen G. Larson (ret.)

As a US District Judge for the Central District of California, Larson adjudicated over a thousand cases, including some of the most notable actions to be tried in the Central District. These actions included United States v. Nazario, a landmark Military Extraterritorial Jurisdiction Act case involving U.S. Marines accused of manslaughter during the Battle of Fallujah; John Doe v. County of San Bernardino, which resulted in systematic reform of educational and therapeutic services for disabled youths within the county juvenile hall system; and Siegel v. Warner Bros. Entertainment, Inc., which determined the ownership of the copyrights to the iconic comic strip Superman.

In nearly ten years as a judge, Larson conducted over 400 settlement conferences, and developed a reputation amongst his colleagues and counsel for creativity in resolving the most difficult cases. The framework he established in United States v. Duro, as just one example, involving coordinating efforts between federal, state, Native American, and private authorities and entities, lead to the ultimate resolution of the US Bureau of Indian Affairs’ decade long effort to close down and expel a major migrant worker camp on the Torres Martinez Indian Reservation is just one such example of his skill in this area.

Since leaving the bench, Larson has been called upon to mediate several major commercial disputes. He has also arbitrated several complex cases, including chairing an AAA panel in Detroit, Michigan handling a $100 million claim in the energy sector; appointed as party arbiter by one of the largest litigation firms in the country on a multi-million dollar fee dispute; and appointed as party arbiter on an ICDR arbitration between two major European energy sector corporations.

Robert C. O’Brien

O’Brien is one of the leading business litigators in the State. A former California Managing Partner of an AMLAW firm, he has been named one of the Daily Journal’s Top 100 Lawyers in California and Law Dragon’s Top 500 Lawyers in America. O’Brien also has significant government experience having served, in among other positions, as a United States Representative to the United Nations General Assembly and, earlier in his career, as a senior legal officer for the UN Security Council commission that decided billions of dollars of government claims against Iraq arising out of Gulf War I.

In addition to his client practice, O’Brien is regularly called upon to serve as a special master by federal judges in the Central District. He has been the special master in such high-profile cases as MGA v. Mattel (“Barbi v. Bratz”), a trade secret and copyright dispute; United States v. Standard & Poors, in which the agency’s ratings of mortgage-backed securities were at issue; Preservation Technologies v. Netflix, et al, a multi-party patent infringement action; and most recently the Allergan proxy securities litigation, presently the largest securities case in the country.

O’Brien is a well-established arbitrator in international and domestic cases. He has been the sole chair, panel chair and wing arbitrator in over a dozen arbitrations over the past decade with parties from the United States, Europe and Asia. These cases have involved oil and gas disputes, cross-border entertainment deals, real estate, intellectual property and Internet matters and government contract arbitrations in the defense space. He is on the ICDR, AAA, HKIAC, WIPO and other lists of neutrals and has been appointed in ad hoc proceedings.


To schedule ADR services with Judge Larson or Mr. O’Brien, please contact Danica Ceballos at 213.436.4888 (direct) or Email her at:

Larson O’Brien ADR Services general terms of engagement can be viewed here.