David H. Marion Senior Counsel

David Marion concentrates his practice on complex business litigation, antitrust and securities class actions, legal malpractice defense, communications law and alternate dispute resolution. David acts as both plaintiffs and defense counsel in such litigation. 

David has achieved numerous noteworthy victories including seven-figure jury verdicts in an unfair competition case against a major broadcast network, and in a vertical price-fixing case; defense of a major public utility in a precedent-setting federal ERISA class action; and victories in the U.S. Supreme Court and numerous state and federal appellate courts. He was appointed by the U.S. District Court as Receiver in a Securities and Exchange Commission civil action involving a Ponzi scheme, and as special master in complex federal multi-district litigation. 

Representative Matters

• Successfully argued in the United States Supreme Court in a case establishing plaintiffs' burden to prove falsity in First Amendment libel cases
• Successful appeals before the Pennsylvania Supreme Court, including a case liberalizing grant of summary judgment for defendants
• Successfully represented a client before the Third Circuit United States Court of Appeals in a precedent-setting ERISA case

Recognition & Involvement

David was elected Chancellor of the Philadelphia Bar Association, is a former President of the Philadelphia Lawyers Club and is the National Chancellor of the Tau Epsilon Rho Law Society. He was elected as a Fellow of the American College of Trial Lawyers, the International Academy of Trial Lawyers and the American Academy of Appellate Lawyers, and holds leadership positions in several non-profit organizations.  

David received the James Wilson Award, the highest honor Penn Law School extends to a distinguished alumnus, and was the recipient of the Judge Learned Hand Award from the American Jewish Committee. He has been listed in Chambers USA as a leading lawyer in commercial litigation since the honor's inception in 2003 and is described as a "very highly regarded trial attorney." Since 2004, in surveys of his peers, David has been selected as a Pennsylvania "Super Lawyer." He is uniquely listed by Best Lawyers in America in six categories of law practice: Appellate Practice, Bet-the-Company Litigation, Commercial Litigation, First Amendment Law, Legal Malpractice Law, and Media Law. David was recently recognized by Best Lawyers as the 2019 Legal Malpractice Law "Lawyer of the Year" award winner in Philadelphia. He was also named one of The Philadelphia Inquirer's "Influencers of Law" for Litigation and Dispute Resolution.