John M. O’Brien

A Career Dedicated
to Justice

Since establishing his own law firm in Elk Grove, California, in 1996, which has since evolved into O’Brien & Zehnder, John O’Brien has dedicated his practice to advocating for individuals who have suffered serious or catastrophic injuries or lost loved ones due to the negligence of others. He established the firm with a commitment to providing compassionate, effective, and results-driven representation to individuals and families during some of the most difficult times in their lives.

Before founding the firm, John spent several years representing defendants in complex litigation matters. This experience provides him with valuable insight into how insurance companies and defense attorneys evaluate and defend personal injury claims. He draws on this knowledge to anticipate opposing strategies and develop thoughtful, creative, and effective approaches tailored to each client's case.

Recognized throughout California's legal community for his aggressive advocacy, integrity, and dedication to his clients, John has earned a reputation as a respected and effective trial attorney. His commitment to achieving meaningful results has led to numerous multimillion-dollar jury verdicts and settlements across a wide range of personal injury cases.

Beyond the courtroom, John is committed to the community he has served for decades. As the founder of an Elk Grove-based law firm, he values the relationships he has built throughout the Sacramento region and believes in giving back to the community. His dedication to making a difference extends beyond representing his clients to supporting the people and community around him.