FacultyFaculty/Author Profile
Ian Simmons

Ian Simmons

O'Melveny & Myers LLP

Washington, DC, USA


Co-chair of the firm’s antitrust and competition practice, Ian Simmons has been lead counsel in more than 30 multi-district litigation (MDL) antitrust proceedings and has achieved precedent-setting results, including winning summary judgment in December 2017 on behalf of Samsung Electronics in the long-running In re Optical Disk Drive litigation in which class plaintiffs were seeking $3 billion in trebled damages. In addition to his extensive experience with cartel cases, Ian litigates matters involving intellectual property issues, including the competitive implications of standard essential patents and FRAND obligations, and has a track record of representing major multinational clients including Marriott International, Asiana Airlines and Kumho Petrochemicals in high-stakes cartel cases. He pays particular attention to global economic pressures that may affect his clients and has taken more than 30 depositions of economists.           

An alumnus of the US Department of Justice Antitrust Division, Ian uses his prosecutorial skills to maximize his clients’ interests. He has argued before the US Court of Appeals for the Second, Third, Fourth, Seventh and Ninth Circuits and the highest courts in New York and South Dakota. Ian has tried seven cases to verdict. His efforts were recognized by Law360, which named Ian an MVP of the Year in Competition in 2011.

Chambers USA regularly ranks Ian for his work in antitrust litigation, and notes his “fine reputation for his multijurisdictional cartel defense work” and reports that clients describe him as “outstanding and incredibly skilled,” commend his “detail-oriented work,” and praise his “encyclopedic knowledge.” Ian is consistently recognized for his work in antitrust by The Legal 500, which labels him a “star of the antitrust bar” along with O’Melveny’s team as “top-drawer,” and by Global Competition Review who recently lauded him for his Samsung victory against Qualcomm in 2017, and shortlisted him for “Litigator of the Year” at the 2015 Global Competition Review awards. Ian was also named a 2017 National Law Journal “antitrust trailblazer” and leading lawyer within the 2018 edition of Who's Who Legal: Litigation.

A five-time moderator or panelist at the American Bar Association Antitrust Spring meeting, and author of over 20 peer review articles, Ian is a Member of the Editorial Board of the American Bar Association Antitrust Magazine. He earned his B.A. from McGill University, his M.A. from Yale University and his J.D. from the University of Pennsylvania.

Ian Simmons is associated with the following items:
CHB Chapters  CHB Chapters Expert Witness Depositions (Substantive Outline) (December 2017) - Fundamentals of Taking and Defending Depositions 2018, Friday, March 09, 2018
Everyone Is Entitled to His Own Opinion...Reflections on the Cross-Examination of Expert Witnesses, Antitrust, Vol. 25, No. 3 (Summer 2011) - Fundamentals of Taking and Defending Depositions 2018, Friday, March 09, 2018
Web Segment  Web Segment Expert Witness Depositions - Fundamentals of Taking and Defending Depositions 2018, Tuesday, March 13, 2018
MP3 Audio  MP3 Audio Expert Witness Depositions - Expert Witness Depositions, Tuesday, March 13, 2018
Transcripts  Transcripts Expert Witness Depositions - Expert Witness Depositions, Tuesday, March 13, 2018
MP4 - Mobile Video Seg  MP4 - Mobile Video Seg Expert Witness Depositions - Expert Witness Depositions, Tuesday, March 13, 2018
On-Demand Web Programs  On-Demand Web Programs Fundamentals of Taking and Defending Depositions 2018, Friday, March 16, 2018, New York, NY
Live Seminar  Live Seminar Fundamentals of Taking and Defending Depositions 2019, Thursday, March 07, 2019, New York, NY
Live Webcast  Live Webcast Fundamentals of Taking and Defending Depositions 2019, Thursday, March 07, 2019, New York, NY
PLI Grpcast-Live Web  PLI Grpcast-Live Web Fundamentals of Taking and Defending Depositions 2019, Thursday, March 07, 2019, Atlanta, GA
Fundamentals of Taking and Defending Depositions 2019, Thursday, March 07, 2019, New Brunswick , NJ
Fundamentals of Taking and Defending Depositions 2019, Thursday, March 07, 2019, Cleveland, OH
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