With a strong track record in antitrust investigations, prosecutions, and enforcement actions, Sheppard, Mullin, Richter & Hampton LLP is frequently instructed by both domestic and multinational clients. Renowned for its expertise in the technology sector, the group brings deep insight into the intersection of antitrust and intellectual property law, handling complex issues like patent pooling, product distribution, and licensing restrictions. Based in Washington DC, the practice is co-led by Leo Caseria, who handles federal and state cartel investigations, and former DOJ official Ann O’Brien, who brings extensive experience in domestic, international, and multi-agency cartel matters, including federal jury trials.
Legal 500 Editorial commentary
- Profile
Key clients
- National Pipe & Plastics, Inc. (a CRH Company)
- Essex Property Trust
- CalPortland Company
- The Reynolds and Reynolds Company
- Cyient
- Export Packers Company
- Progressive Insurance
Work highlights
- Representing National Pipe & Plastics, Inc. (a CRH Company) in the newly consolidated civil antitrust class action In re: PVC Pipe Antitrust Litigation in the Northern District of Illinois.
- Defending Essex Property Trust in an antitrust class action.
- Representing CalPortland in its antitrust claim against the four major U.S. railroads (Union Pacific, BNSF, CSX and Norfolk Southern).
Lawyers
Next generation partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Leo Caseria; Ann O'Brien