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M. Brian O’Connor



M. Brian O’Connor
Direct dial/Fax: 412-338-4762
Cell: 412-552-0527

Assistant Contact

Danielle Grimm

Mr. O’Connor has been a member of the firm for 20 years. His practice is devoted to the representation of physicians and hospitals in medical malpractice cases. Brian also represents health care providers in litigation before the Pennsylvania State Board of Medicine.

Mr. O’Connor has tried over 45 jury trials on behalf of physicians and hospitals throughout the counties of Western Pennsylvania and the Federal District Court in Pittsburgh and Erie. Mr. O’Connor has participated in numerous mediations and arbitrations in health care related litigation.

Mr. O’Connor is a frequent lecturer to physician organizations and a member of the Health Care Law Section of the Allegheny County Bar Association. He is also a Fellow in the Academy of Trial Lawyers of Allegheny County, membership of which is by invitation only.

Mr. O’Connor has been a Pennsylvania Super Lawyer for the defense of medical malpractice defense cases since 2009. He is also a past-president of the St. Thomas More Society, an organization of Catholic lawyers. Prior to joining Matis Baum O’Connor, Brian was an assistant district attorney in Allegheny County. Mr. O’Connor is admitted to practice in the state and federal courts of Pennsylvania and the District of Columbia.

In 2016, Brian was recognized in the 23rd Edition of The Best Lawyers in America for his work in the practice area of “Medical Malpractice Law-Defendants.”


Plaintiff alleged ENT surgeon was negligent in retained pledget during ZMC surgery. Verdict in favor of defense on motion for non-suit after 2 days of trial.

Plaintiffs alleged failure to adequately treat glaucoma resulting in blindness. Verdict for defense

Plaintiff claimed radiologist failed to properly interpret CT scan of abdomen and pelvis resulting in delay in diagnosis of Thymoma. Verdict for defense.

Plaintiff claimed obstetrician/gynecologist was negligent for perforating ureter during C-Section. Verdict for defense.

Plaintiff claimed failure to diagnose pituitary tumor resulting in blindness. Non-suit granted after six days of trial.

Plaintiffs alleged failure to timely diagnose lung cancer. Verdict for defense

Plaintiffs alleged failure to adequately treat glaucoma resulting in blindness. Verdict for defense

Publications and Presentations

The Current State of Medical Malpractice Litigation in Pennsylvania

  • ACBA Health Care Section Meeting

The Medical Protective Company Risk Management Seminar

GE Medical Protective Company Risk Management Education Presentation

MCare Act, Informed Consent, Certificates of Merit and Status of Tort Reform

Evidence in Personal Injury Cases – Demonstrative Evidence

  • Pennsylvania Bar Institute

Podiatric Risk Management Seminar

Tough Problems in Medical Malpractice

  • Pennsylvania Bar Institute (PBI), Pittsburgh, PA

Medical Malpractice? A Case Study

  • The Western Pennsylvania Hospital

Recent changes in PA Law Affecting Physicians

Informed Consent and Other Issues Facing Physicians

  • Blair Medical Associates, Altoona, PA

Status of Tort Reform in Pennsylvania

Malpractice Issues for the Primary Care Physician

  • St. Francis Medical Center – Medical Grand Rounds

Medicolegal Issues in Foot and Ankle Surgery

  • The Western Pennsylvania Hospital Scott Alter, DPM, Memorial Lecture Series


Commonwealth of Pennsylvania, 1989

District of Columbia, 1991

U.S. District Court for the Western District of Pennsylvania, 2007



John Carroll University

B.A., 1986

The Catholic University of America, 1989

Professional & Community Involvement

Pennsylvania Super Lawyers

Academy of Trial Lawyers of Allegheny County, 2009-Present

Member Allegheny County Bar Association, Health Care Law Section

American Bar Association-Litigation Section

Defense Research Institute-Medical Malpractice Section

President, Christian Housing, Inc., 2006-July 2017

Best Lawyers Award Badge