Sean is a Senior Partner with Marks, O’Neill, O’Brien, Doherty & Kelly, P.C. and the managing partner of the firm’s New Jersey office. Sean also heads the Professional Liability practice group.
Prior to joining the firm, Sean tried numerous cases while serving as an assistant District Attorney in the City of Philadelphia under now Chief Justice Ronald Castille. In his over twenty-five years of experience at Marks, O’Neill, O’Brien, Doherty & Kelly, P.C., Sean has handled various types of professional liability litigation, including medical and legal malpractice claims and those against insurance, financial and real estate professionals. Sean has extensive experience in complex employment and D&O litigation including claims of discrimination, wrongful termination and executive malfeasance. His practice also includes a significant amount of class action litigation ranging from national medical billing litigation to FDCPA and TCPA claims.
In municipal and constitutional law practice, Sean defends school boards, law enforcement and public officials against claims of constitutional deprivation and allegations of excessive force. He has appeared before the United States Third Circuit Court of Appeals, the New Jersey Supreme Court and briefed such matters for the United States Supreme Court.
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