Gregory L. Kinzelman advises on mergers and acquisitions for private equity funds, and he has extensive experience with public and private transactions, both domestic and international. Specifically, he advises on Hart-Scott-Rodino Act compliance for complex transactions, including on Federal Trade Commission and Department of Justice regulations and procedures. In addition, he focuses his practice on pre-merger counseling and preparation of planning strategies for managing filings and second requests. Greg also has significant experience successfully guiding foreign purchasers of U.S. businesses through the Committee on Foreign Investment in the United States (CFIUS) process.


Pre-merger counseling and preparation of planning strategies for managing filings and second requests, and coordination of responses to agency requests for additional information. 

Coordinates merger control filing for multi-national mergers in jurisdictions including the EC, Canada, Latin America, Asia and Africa. 

Represented numerous private equity clients, including Insight Equity, Carlisle Infrastructure Partners and Arclight Capital Partners, in various acquisitions with respect to HSR and antitrust compliance.

Represented Fortune 200 companies, including Chevron, Exxon-Mobil, Delta Air Lines, Duke Energy, Lowe's, Raytheon and Smithfield Foods, in various acquisitions with respect to HSR and antitrust compliance

Represented Chinese energy companies in successfully obtaining CFIUS approval for acquisitions of US petroleum energy production facilities and waste-to-energy technology.

Litigation experience includes preparation of pleadings and briefs in antitrust cases before federal and state courts and agencies.

Advises corporations, trade associations and their political action committees on campaign finance law compliance.

Significant pro bono representation of organizations promoting the arts and architectural preservation, including the Washington Area Lawyers for the Arts and The Science Museum of Virginia Foundation.


“When Is Antitrust Merger Review Over? Judge Considers Separating Merged Company Pending Review of DOJ Settlement (CVS/Aetna),” SRZ Alert, Dec. 10, 2018 (co-author); republished in Law360, December 2018

CFIUS: What Private Equity Funds Need To Know About Mandatory Declarations and the Expansion of Transactions Subject To Review,” SRZ Alert, Nov. 9, 2018 (co-author); republished in EurekaHedge, December 2018

Qualcomm: CFIUS Halts Board of Directors Proxy Fight, Blocks Foreign Company Effort to Acquire a US-Based Semiconductor Company,” SRZ AlertMarch 29, 2018 (co-author)

“Increased HSR Act Thresholds Announced for 2018,” SRZ Alert, Jan. 30, 2018 (co-author)

“Increased HSR Act Thresholds Announced for 2017,” SRZ Alert, Feb. 17, 2017 (co-author)

Premerger Notification Practice Manual (ABA Section of Antitrust Law) Fifth Edition, 2015 (contributor)

“Filers learn to adapt to changes under Hart-Scott-Rodino,” The National Law Journal, 28, 2011

“The 2011 Changes to the HSR Act Notification Form: A Guide for Practitioners,” The Antitrust Source, Vol. 10, Issue 6, August 2011

“CFIUS — A New Challenge for Foreign Investors in the US Renewables Market,” Renewable Energy Quarterly, May 2010

United States v. Malone: Lessons for HSR Practitioners on Premerger Notification Office Informal Interpretations,” The Antitrust Source, Vol. 9, Issue 3, February 2010

“The Next Step in Merger Review Process Reform - Foreign Language Documents,” Bloomberg Antitrust Law Report, July 2009

“Hedge Funds Struggle with HSR Notification Regime,” The Threshold, Vol. VII, No. 1, Winter 2006-2007

Speaking Engagements

SPVs, NOLs and HSR,” SRZ 8th Annual Shareholder Activism Conference, New York, October 2017

“The Hart-Scott-Rodino Act: Recognizing Covered Transactions,” The Knowledge Group Webcast, February 2016

“CFIUS and Acquisition of US Businesses by Chinese Companies,” China Merchants Bank China-US Cross Border Mergers and Acquisition Forum, October 2015

“CFIUS Compliance for Chinese State Owned Enterprises,” Harvard Kennedy School of Government Asia Energy Leaders Program, June 2013

“Hart-Scott-Rodino Premerger Notification Basics,” ABA Section of Antitrust Law Mergers & Acquisitions Committee and Young Lawyers Division Antitrust Committee Program, December 2010


  • American Bar Association
    • Section on Antitrust Law
  • New York State Bar Association

Prior Experience

  • Counsel, Hunton & Williams, 1997-2017
  • Trial Attorney, Federal Trade Commission, Bureau of Competition, 1994-1997