Timothy Walbert has served as a member of the Board since April 2023. Mr. Walbert is currently a senior advisor to Amgen, a biotechnology company. Mr. Walbert was chairman, president and chief executive officer of the then public company Horizon Therapeutics, a biotechnology company, from June 2008 to October 2023, when it was acquired by Amgen for $28 billion. Before joining Horizon, he was president, chief executive officer and director of IDM Pharma Inc., a public biotechnology company, which was acquired by Takeda in June 2009. Before IDM, Mr. Walbert served as executive vice president, commercial operations at NeoPharm Inc., a public biotechnology company. From 2001 to 2005, he was divisional vice president and general manager, immunology, at Abbott, now AbbVie, leading the global development and launch of the multi-indication biologic HUMIRA, and served as divisional vice president, global cardiovascular strategy. From 1998 to 2001, Mr. Walbert served as director, CELEBREX North America, and arthritis team leader, Asia Pacific, Latin America and Canada, at G.D. Searle & Company. From 1991 to 1998, he also held sales and marketing roles with increasing responsibility at G.D. Searle, Merck & Co. Inc. and Wyeth. Mr. Walbert serves on the boards of directors of Century Therapeutics, Inc., BioMarin Pharmaceutical Inc. and Sagimet Biosciences Inc., each public biotechnology companies, as well as Cour Pharmaceuticals Development Co., Inc., Latigo Biotherapeutics, Inc., Catalent, Inc., Odyssey Therapeutics, Inc. and Crystalys Therapeutics Inc., each privately held biotechnology companies. He is also a member of the National Organization for Rare Disorders (NORD) Advisory Board, the Wall Street Journal CEO Council and the CNBC CEO Council. He previously served on the board of directors for Aurinia Pharmaceuticals Inc., a public pharmaceutical company, from 2020 to 2022, Exicure, Inc., a public biotechnology company, from 2019 to 2022, Assertio Holdings, Inc., a public biopharma company, from 2014 to 2020, Raptor Pharmaceutical Corp., a public biotechnology company, from 2010 to 2014, XOMA Corporation, a public biotechnology company, from 2011 to 2017 and Sucampo Pharmaceuticals Inc., a public biopharmaceutical company, from 2016 to 2018. He is also a member of Economic Club of Chicago, the Commercial Club of Chicago and the Civic Committee of the Commercial Club of Chicago. Mr. Walbert was a previous board member of the Biotechnology Innovation Organization (BIO), the Pharmaceutical Research and Manufacturing Association (PhRMA), the Illinois Biotechnology Innovation Organization (iBIO) and World Business Chicago and served on the Board of Trustees of Muhlenberg College. Mr. Walbert received a B.A. in business from Muhlenberg College in Allentown, Pennsylvania. Skills and Qualifications specific to Mirum Pharmaceuticals, Inc.: The Board and Nominating Committee believe that Mr. Walbert s extensive experience in the biotechnology business, including as a president and chief executive officer, qualifies him to serve on the Board.