Gregory assists clients in navigating the U.S. merger control regime from a substantive and strategic perspective and in complying with U.S. and global merger control obligations. He also represents clients in non-merger conduct investigations by the antitrust agencies, including cartel matters, and in antitrust civil litigations.

Gregory routinely represents clients in matters before the U.S. Department of Justice and Federal Trade Commission, as well as in antitrust litigation before courts in a variety of U.S. jurisdictions.