Sergei Zaslavsky

O'Melveny & Myers LLP

Sergei Zaslavsky is an antitrust attorney with broad experience in trials, regulatory merger reviews, conduct investigations, antitrust audits, and antitrust counseling. Sergei effectively represents his clients by being both detail-oriented and strategic, and by studying his clients’ businesses to understand how legal questions intersect with marketplace realities.

In doing this, he is able to synthesize antitrust doctrine, economics, and facts into advocacy that is both rigorous and intuitive. Sergei participated in two federal antitrust trials in 2015 and 2016. One was a bench trial involving a merger challenge; the other an illegal restraint of trade private action tried in front of a jury.

Sergei helped prepare both fact and expert witnesses, and, in both trials, Sergei was responsible for second-chairing the direct and cross examinations of the economic experts. Sergei has extensive experience in both plaintiff- and defense-side antitrust work. As a plaintiff, Sergei was a key member of the US Airways trial team that won a jury verdict against Sabre after an eight-week trial, and the team that represented Honeywell in challenging a competitors’ merger in the interactive security industry.

On the defense side, Sergei was part of the litigation team that paved the way for US Airways’ merger with American Airlines by obtaining favorable settlement in the DOJ’s suit seeking to block the merger.


  • Prepared key fact witnesses and second-chaired economic experts’ direct and cross examinations in US Airways v. Sabre, an eight-week trial that resulted in a favorable jury verdict and garnered Global Competition Review’s “Litigators of the Week” Award for the O’Melveny trial team.
  • Represented US Airways in litigation against the DOJ in its merger with American Airlines. The representation garnered Global Competition Review’s 2014 Matter of the Year Award.
  • Represented Honeywell in its lawsuit to block competitors’ merger.
  • Represented Honeywell in its acquisition of Intermec.
  • Second-chaired economic experts’ direct and cross examinations at D.D.C. merger trial.
  • Represented Fortune 100 Company in FTC investigation relating to joint venture agreement and IP licensing issues.
  • Counseled major clinical laboratory company on licensing issues.
  • Conducted antitrust audit for Fortune 500 petrochemical company.


  • District of Columbia
  • Maryland


  • Harvard University, J.D.: magna cum laude
  • Dartmouth College, A.B., Economics: summa cum laude


  • ABA Antitrust Section


Rate : $$$

What types of cases Attorney Sergei Zaslavsky & O'Melveny & Myers LLP can handle?
O'Melveny & Myers LLP can handle cases related to laws concerning Litigation, Antitrust & Trade, Aviation. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is O'Melveny & Myers LLP located?
O'Melveny & Myers LLP is located at 1625 Eye Street, Washington, DC 20006, USA. You can reach out to O'Melveny & Myers LLP using their phone line 202-383-5162. You can also check their website or email them at [email protected].
How much would it cost to hire O'Melveny & Myers LLP?
Sergei Zaslavsky lawyer charges are specific to each case. However, they work with contingency fees and its ranges from $$ to $$$. They also provide free consultation [and no obligation quotes] if you are interested to hire.
Are Sergei Zaslavsky reviews trust-able?
We have the ratings and reviews moderation team who checks and verifies every review submitted on our website manually. You can trust all the reviews you see on Sergei Zaslavsky lawyer profile listing.

Rate and write a review

Your email address will not be published. Required fields are marked *

Is this your profile?Claim it now.

Make sure your information is up to date.
O'Melveny & Myers LLP
Washington 20006 DC US
Get directions

Brian Orlow

Main Street 71-18
11367 NY US

Lina Stillman

Broadway 42
New York 10006 NY US