John Terzaken

Simpson Thacher & Bartlett LLP

John Terzaken is a Partner in the Firm’s Litigation Department. John represents domestic and international clients in government enforcement and private litigation of cartel and other alleged antitrust violations, market sector investigations and antitrust compliance, encompassing all major industry sectors, including financial institutions, pharmaceutical, professional services, manufacturing, energy, shipping, food and beverage, and many others. His work highlights include defending:

  • A global financial institution in criminal investigations and related follow-on civil class action litigation involving trading of securities.
  • A multinational consumer foods corporation in a criminal antitrust investigation and related follow-on civil class action litigation involving the seafood industry.
  • A global semiconductor device company in civil class action litigation involving DRAM products.
  • A national healthcare provider in a criminal antitrust investigation into physician services.
  • A multinational shipping company in a criminal investigation into potential antitrust violations.
  • A global chemical company in a criminal investigation and related follow-on civil class action litigation involving polyurethane products.

Prior to joining Simpson Thacher, John held a leading position in the DOJ’s Antitrust Division as Director of Criminal Enforcement, where he oversaw the Division’s criminal enforcement nationwide. His range of responsibilities included presiding over some of the largest global cartel investigations ever undertaken by the DOJ.

He also served as the Division’s chief liaison with domestic and international law enforcement authorities, as well as the Financial Fraud Coordinator for inter-agency prosecutions and investigations. John’s DOJ service earned him awards of distinction from the Attorney General of the United States and the Assistant Attorney General for the Antitrust Division.

He is consistently recognized as a leading antitrust lawyer (Band 1) by both Chambers Global and Chambers USA, where clients describe him as “one of the strongest lawyers I have ever worked with,” “highly professional and very responsive,” an attorney who “knows the technical aspects of antitrust law and also how to intuitively apply that to business realities,” and has a “wonderful working manner with clients and government figures.”

John is a member of the Antitrust Sections of the American Bar Association (ABA) and International Bar Association (IBA) and is presently serving an appointment by the ABA on the International Cartel Task Force. He regularly writes and speaks on antitrust matters for industry publications and events, including serving as the co-Editor of the Cartel and Leniency Review.

John received his J.D. from University of Virginia School of Law, where he was on the Editorial Board of the Virginia Law Review. He received his B.A., magna cum laude, from American University in 1996.


  • University of Virginia School of Law, 2000 J.D.
    • Editorial Board, Virginia Law Review
  • American University, 1996 B.A.
    • magna cum laude


  • American Bar Association, Section of Antitrust Law; Member of the International Cartel Task Force
  • International Bar Association, Antitrust Committee


  • District of Columbia 2001
  • U.S. Court of Appeals for the Fourth Circuit 2000
  • Virginia 2000
  • U.S. District Court Eastern District of Virginia 2000
  • U.S. Court of Appeals for the Second Circuit 2017
  • Supreme Court of the United States


Rate : $$$

What types of cases Attorney John Terzaken & Simpson Thacher & Bartlett LLP can handle?
Simpson Thacher & Bartlett LLP can handle cases related to laws concerning Financial Services, Litigation, Business, Health Care, Antitrust & Trade, Privacy, International Law, Government, Energy Utilities & Environmental. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
Where is Simpson Thacher & Bartlett LLP located?
Simpson Thacher & Bartlett LLP is located at 900 G St NW, Washington, DC 20001, USA. You can reach out to Simpson Thacher & Bartlett LLP using their phone line 202-636-5858. You can also check their website or email them at [email protected].
How much would it cost to hire Simpson Thacher & Bartlett LLP?
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