Ken Field is a nationally recognized leader in antitrust and health care law and is co-chair of Jones Day's global Health Care Practice. He advises clients on all aspects of antitrust and competition law and regularly appears before the United States Department of Justice (DOJ), the Federal Trade Commission (FTC), and state antitrust enforcement authorities. Ken has a broad range of experience in M&A, government investigations, litigation, compliance programs, and other complex competition issues and counsels clients in various industries in addition to health care, including retail, consumer products, packaged foods, telecommunications, manufacturing, transportation, energy, and more.

Ken rejoined Jones Day following six years at the FTC, where he served as Counsel to the Director of the Bureau of Competition and as lead attorney on significant FTC investigations and litigated merger challenges. He began his career with the Antitrust Division of the DOJ before joining Jones Day as an associate in 2002.

In 2017 and 2018, Who's Who Legal recommended Ken "for his proficiency handling major merger reviews" and "his brilliant merger defense work in the healthcare sector," calling him a "collaborative and creative thinker" who "brings the perfect combination of client service and government experience." He was also named a Law360 Health Law MVP in 2016 for his work on three high-profile merger and litigation matters. A member of the American Health Lawyers Association and American Bar Association Sections of Antitrust and Health Care Law, Ken frequently speaks and writes on important antitrust and health care issues.