Sean O’Neill

Partner & Trial Lawyer
Stalwart Law Group
Personal Injury

As partner and trial lawyer at Stalwart Law Group, Sean O’Neill leads the firm’s medical malpractice and elder abuse division with a reputation for securing record-setting results in high-stakes negligence cases. Since joining the firm in 2020, he has secured more than $200 million in recoveries, including a $28.7-million verdict for medical malpractice involving brain injury and multiple eight-figure settlements in cases of surgical error and cerebral palsy. Known for his ability to navigate the medical and legal complexities of elder care negligence, O’Neill has quickly emerged as a top plaintiff-side advocate in California. He was nominated for CAALA’s Trial Lawyer of the Year in 2024 and named to Best Lawyers: Ones to Watch, Lawdragon 500: Next Generation and Super Lawyers Rising Stars.