Sean O’Neill is a trial lawyer specializing in catastrophic personal injury, elder abuse, wrongful death, managed care liability, and medical malpractice matters on behalf of Plaintiffs throughout California.
Sean was born and raised in Carlsbad, California. He is a graduate of the University of Arizona and Pepperdine University School of Law. While in law school, Sean clerked in the United States Senate, Judiciary Committee, the Los Angeles County District Attorney’s office and for a number of high-profile litigation firms in Los Angeles. Mr. O’Neill was also selected to serve as a special editor to the Harvard Journal of Law & Public Policy.
After law school Sean served as corporate counsel at United States Steel Corporation in Pittsburgh, Pennsylvania. Reporting directly to the General Counsel, Sean assisted with the Company’s international trade enforcement litigation, the Company’s engagement on public policy issues, and advised the business units on a number of high priority corporate matters. Thereafter, Sean returned to California to work as a trial lawyer at Reback, McAndrews, Kjar, Warford & Stocklaper where he defended medical and legal malpractice cases throughout the State. While Sean really enjoyed learning from the great lawyers at the firm it was always his calling to represent victims of negligence, so he joined McMahan Law, PC to focus his practice exclusively on representing Plaintiffs in personal injury matters. While at McMahan Law, PC Sean’s practice focused on representing victims of elder abuse and medical malpractice. During his time at the firm Sean gained valuable litigation and trial experience—helping the firm’s clients secure more than $40,000,000.00 in settlements and awards.
Sean is deeply passionate about providing a voice to our society’s most vulnerable population—our seniors. Sean has dedicated his practice to brining justice to seniors who have suffered egregious injuries including: wrongful death, bedsores, fractures, multiple falls, dehydration, and other catastrophic injuries while residing at Nursing Homes, Assisted Living Facilities or a Hospital. Sean has secured tens of millions in settlements for elder abuse victims in California. His settlements include multiple seven figure and one eight figure settlement.
Many birth injuries are caused by medical negligence. Sean has represented numerous minors and their parent who have suffered catastrophic injuries during the labor and delivery process. Within this field Sean has extensive experience representing children who have suffered a permanent brachial plexus paralysis injury from the negligent management of a shoulder dystocia delivery. Sean has successfully secured tens of millions of dollars in structured settlements for his minor clients, which will help these children get the care they need as they mature into adulthood and beyond.
Patients trust doctors and other healthcare professionals with their lives. When these professionals make mistakes that cause a patient harm, it may be considered medical malpractice. Sean specializes in catastrophic medical malpractice cases and is dedicated to bringing justice to those who have been permanently injured or killed as a result of medical negligence. This fight for justice also includes public advocacy on ending the injustice of MICRA, a law passed in 1975 that arbitrarily and unjustly caps general damages (pain, suffering, disfigurement and loss of enjoyment of life) at $250,000.00.
- University of Arizona, B.A.
- Pepperdine University School of Law, J.D.
PROFESSIONAL ASSOCIATIONS AND MEMBERSHIPS
- Consumer Attorneys Association of Los Angeles
- Consumer Attorneys of California
- California Advocates for Nursing Home Reform
- American Association for Justice
- Founding 50 Member of Justice HQ
- Member of the National Trial Lawyers Top 40 Under 40, 2018-present
- American Board of Trial Advocates Sidebar Program (Los Angeles Chapter), 2018