Overview

Deirdre Mulligan joined Shub Johns & Holbrook as an associate attorney in December 2025. Prior to joining the firm, she represented plaintiffs in class action pharmaceutical antitrust litigation such as In re QVAR Antitrust Litigation (D. Mass.), In re Actos Antitrust Litigation (S.D.N.Y.), In re Glumetza Antitrust Litigation (N.D. Cal.), In re HIV Antitrust Litigation (N.D. Cal.), and In re Suboxone Antitrust Litigation (E.D. Pa.). She also specialized in international human rights cases, representing the Government of Mexico in gun-trafficking case Estados Unidos Mexicanos v. Diamondback Shooting Sports et al. (D. Ariz.), “Hotel Rwanda” hero and kidnapping victim Paul Rusesabagina in Rusesabagina v. Gainjet (W.D. Tex.), and the families of cross-border shooting victims of U.S. Border Patrol in Family Members of Sergio Adrián Hernández Güereca, et. al., v. United States of America (IACHR).

Ms. Mulligan is a graduate of Drexel University Thomas R. Kline School of Law where she received CALI Awards in Antitrust Law and Legal Methods, interned with an Am Law 100 pro bono department assisting asylum seekers, and volunteered with an immigration non-profit. She earned her B.A. at Cornell University College of Arts and Sciences, where she double majored in History and Feminist, Gender & Sexuality Studies and served as Sergeant at Arms for Alpha Phi Omega National Service Fraternity.

Admissions

• United States District Court for the Eastern District of Pennsylvania
• Supreme Court of Pennsylvania

Education

• Drexel University Thomas R. Kline School of Law, J.D., 2021
• Cornell University, B.A. in History and Feminist, Gender & Sexuality Studies, 2011