Mr. Mark retired in August 2022 as Chairman and President of Ameren Illinois Company, a multi-billion dollar energy and utility company responsible for electric and natural gas distribution to more than 1.2 million electric and 800,000 natural gas customers in Illinois. He joined Ameren in 2002 as Vice President of Customer Service before moving up to various senior management roles. Before joining Ameren, Mr. Mark served for 11 years at Ancilla Systems Inc. While at Ancilla, the parent company to St. Mary s Hospital in East St. Louis, Illinois, he served as Vice President for Governmental Affairs and Chief Operating Officer before becoming Chief Executive Officer of St. Mary s Hospital in East St. Louis, Illinois from 1994 to 2002. He served as Director of Union Electric Company from 2005 until 2012 and was Chairman of Ameren Illinois (both subsidiaries of Ameren Corporation) from 2012 to 2022. Mr. Mark earned his B.S. from Iowa State University and his M.S. from National Louis University.