Toby Singer is one of the nation's leading authorities on mergers and other antitrust matters in the health care industry, and her practice focuses on antitrust counseling and litigation for health care clients. She represents providers and payers on a wide variety of antitrust issues, from mergers and acquisitions and other transactions to less formal alliances among competitors as well as counseling on conduct issues. She has handled numerous federal and state government investigations and has defended clients in both government and private antitrust litigation.

Significant representations include Yale-New Haven Hospital's acquisition of the Hospital of Saint Raphael (FTC File No. 111-0139), CaremarkRx's acquisition of AdvancePCS (FTC File No. 03-0239), and Sutter Health's merger with Summit Medical Center (130 F. Supp. 2d 1109 (N.D. Cal. 2000)), as well as defending class action lawsuits against Ascension Health (Cason-Merenda v. Detroit Medical Center (E.D. Mich.) and Fleischman v. Albany Medical Center (N.D.N.Y.)). Prior to joining Jones Day, Toby served as a deputy assistant director in the Bureau of Competition of the Federal Trade Commission.

Toby is a member of the board of directors of the American Health Lawyers Association as well as a past chair of the AHLA Antitrust Practice Group. She has served as a vice chair of the Health Care Committee of the American Bar Association Section of Antitrust Law and has been on the advisory board of BNA's Health Law Reporter. She is a frequent speaker on health care antitrust subjects and has testified at government hearings on competition in health care.