Mr. Heiden has served as Chair since May 2022. Mr. Heiden brings 35 years of experience in the biotechnology and pharmaceutical industry to the MacroGenics Board of Directors. Mr. Heiden most recently spent eight years as President, Chief Executive Officer and board member of AMAG Pharmaceuticals building a diverse portfolio of commercial and development-stage products, and in 2020 the company was acquired by a private equity firm (Apollo, through Covis Pharma) for $650 million. Prior to joining AMAG, he served as President and Chief Executive Officer of Genzyme Transgenics Company (GTC), from June 2010 to May 2012, which was acquired by LFB, S.A. Before joining GTC, Mr. Heiden was the President, Chief Executive Officer and board member of venture-backed Elixir Pharmaceuticals, from September 2004. Mr. Heiden also serves on the board of directors of Atara Biotherapeutics, Inc. Mr. Heiden had previously served as President and Chief Operating Officer of Praecis Pharmaceuticals from 2002 to 2004, which was acquired by GlaxoSmithKline plc. From 1987 to 2002, Mr. Heiden progressed through various positions of increasing responsibility at Schering-Plough Corporation (now Merck & Co.), including managing a number of businesses in the United States, Europe and Canada. Mr. Heiden holds an M.B.A. from Cornell University’s Johnson Graduate School of Management, a Master’s in International Management from the University of Louvain (Belgium) and a B.A. degree in finance from the University of Florida.