Jack Sidorov is a Senior Counsel in the Antitrust and Trade Regulation practice of Lowenstein Sandler’s Litigation Group, resident in the firm’s Washington, DC office. He joined the firm in 2014 after a 36-year career at the Antitrust Division of the U.S. Department of Justice (DOJ).
For more than 30 years, Jack was the Division’s primary expert on premerger notification law, procedures and policies under the Hart-Scott-Rodino (HSR) Act, providing HSR-related advice to the Assistant Attorney General for Antitrust and throughout the Antitrust Division.
Jack played a leading role in roughly 50 civil penalty compliance cases brought under the HSR Act, working to develop and articulate the legal theories underlying these cases, up to and including DOJ’s November 2014 case alleging and settling gun-jumping claims against Flakeboard and SierraPine. The settlement required the companies to pay a combined $3.8 million in civil penalties for violating the HSR Act, and further required Flakeboard to disgorge an additional $1.15 million in illegally obtained profits for violating Section 1 of the Sherman Act.
Jack worked closely with the Federal Trade Commission’s Premerger Notification Office on all HSR rulemakings since 1983, including rules promulgating HSR exemptions (1996), implementing legislative changes to the HSR Act (2002), revising the HSR treatment of partnerships and limited liability companies (2005), and substantial changes to the HSR Form designed to improve the utility of the Form to the FTC and DOJ while reducing burden on filing parties (2011).
Working with the Antitrust Division’s Foreign Commerce Section, Jack also regularly advised other countries on premerger notification law and best practices through various international antitrust bodies, including the International Competition Network and the OECD Competition Committee.
While at the DOJ, Jack also advised on a range of non-HSR issues, from monopolization law relating to loyalty discounts and other unilateral conduct, to antitrust issues arising in the context of college and professional sports. Early in his DOJ career, he was part of the Department’s AT&T Relief Task Force, developing plans for the relief ultimately obtained in the monopolization case against AT&T and preparing the relief case for trial.
Before embarking on his legal career, Jack founded and served as Commissioner of the World Stickball Association, which played its games on the campus of Harvard Law School. His game-winning home run in Stickbowl III was shown on NBC in May of 1976.
