Gregory (Greg) Heltzer focuses his practice on defending mergers and acquisitions and has successfully defended mergers for Constellation Brands, DaVita, Mars, Martin Marietta Materials, Olam, TreeHouse Foods, Motorola Solutions, Le Duff America, JAB Partners (Coty), Aleris, Worthington Industries, and Blackboard among others. His advice allows C-Suite decision makers to ensure that time and money are not wasted on potential transactions without a viable path for clearance. When transactions move forward, Greg guides clients through the clearance process with a focus on providing enforcers with the information needed so that the merging parties can avoid or at the very least significantly reduce the scope of a costly/time-consuming Second Request.  Greg analyzes the antitrust implications of most transactions involving a publicly traded company (>800). In addition, he handles complex antitrust litigation, government investigations and antitrust counseling (e.g., information exchange, integration planning, Noerr-Pennington immunity).

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  • Constellation Brands in multiple acqs, including the sale of 30+ brands to E. & J. Gallo (wine and spirits)
  • NGC (National Gift Card) in its sale to Blackhawk Network (gift cards)
  • Bemis in its merger with Amcor (flexible packaging)

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  • The Legal 500 United States 2018 to 2019
  • Super Lawyers, Rising Star 2016 to 2017


  • American Bar Association, Antitrust Section


Georgetown University Law Center, JD, cum laude, 2003
Dartmouth College, AB, 1999

District of Columbia

Courts / Agencies
US District Court for the District of Columbia

Gregory E. Heltzer

Insights & Events / Media

Virtual Event Series / McDermott Event / January 21 – February 4, 2021

Webinar / Speaking Engagements / June 14, 2017

Today's General Counsel / June 13, 2017

Corporate Counsel / March 22, 2017