USA Guide 2026 : USA - Nationwide
Ranked Individual
Provided by Sheppard, Mullin, Richter & Hampton LLP
Sheppard delivers practical advocacy in complex antitrust and competition matters worldwide, from cartel investigations to antitrust litigation to merger reviews.
With former DOJ, FTC and DG Comp officials, global reach and proven trial success, we deliver strategic antitrust solutions for complex matters.
We help companies and executives contain business risk by anticipating government tactics, moving quickly to identify early resolution opportunities and advancing business priorities. When litigation is necessary, our team’s record of court victories sets us apart.
Our lawyers guide mergers and acquisitions through DOJ and FTC reviews, manage Hart-Scott-Rodino (HSR) filings and coordinate multi-jurisdictional matters for leading clients in technology, healthcare, life sciences, energy, financial services, aerospace and defense, media and consumer products. We play central roles in groundbreaking cases involving big tech, digital platforms, AI, data-driven pricing and healthcare antitrust challenges.
Provided by Chambers
Sheppard, Mullin, Richter & Hampton LLP is noted for its work on both civil and criminal investigations, as well as any subsequent litigation. With prior experience at the DOJ, the team is equipped to provide understanding and government perspective to its clients.
Provided by Chambers
Sheppard, Mullin, Richter & Hampton represented Fluor Federal Services, Inc. in the defense of a no-poach antitrust class action.
Provided by Chambers
Sheppard Mullin provides a true sense of partnership as well as excellent client service.
Provided by Chambers
Ann O'Brien is skilled in handling both criminal and civil investigations and litigation. Clients benefit from her prior experience at the DOJ.
Ann is a fantastic and highly sophisticated attorney with invaluable experience and understanding of the law. She is also incredibly client-oriented.
Antitrust: Cartel
Provided by Sheppard, Mullin, Richter & Hampton LLP
Ann O'Brien
View profile of Ann O'Brien
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