Biography
Dionne’s principal area of practice is antitrust and trade regulation law. Her practice includes counseling clients with respect to merger and non-merger related activities, litigation, and representing clients before the U.S. Department of Justice and the Federal Trade Commission in connection with mergers and acquisitions, joint ventures, and other commercial arrangements.

Prior to joining the firm in 2000, Dionne served as a Trial Attorney at the U.S. Department of Justice Antitrust Division. At the Department of Justice, Dionne conducted a variety of civil merger and non-merger investigations. Her practice included reviewing Hart-Scott-Rodino filings, conducting witness interviews and depositions, drafting Second Requests and subpoenas, developing case strategies, and preparing cases for trial.

While at the firm, Dionne has represented various clients in responding to antitrust investigations conducted by the Department of Justice, Federal Trade Commission, and various state antitrust agencies. She has also represented clients engaged in international mergers, and has assisted clients with premerger notification filings around the world. Dionne has represented and advised clients on a broad range of antitrust issues in a number of industries, including energy, book publishing, technology (e.g., computers, semiconductors, software), food manufacturing, health care, pharmaceutical, consumer products, and others.