Mr. Abdun-Nabi held several senior leadership positions at Emergent BioSolutions Inc. from 2004 until his retirement in March 2019, including President, Chief Executive Officer, Chief Operating Officer and General Counsel. He also served as a director at Emergent and currently serves as a director at Aptevo Therapeutics Inc. Prior to joining Emergent, Mr. Abdun-Nabi served as General Counsel for IGEN International, Inc., and as Senior Vice President–Legal Affairs, General Counsel and Secretary at North American Vaccine, Inc.

Mr. Abdun-Nabi received a Master of Laws in taxation from Georgetown University Law Center, a J.D. from the University of San Diego School of Law and a B.A. in political science from the University of Massachusetts, Amherst.