St. Louis, MO (KSDK) - A former executive with Ameren Missouri has been named the new chairman, president and CEO of Ameren Illinois Company.
Richard J. Mark had taken over the roles of the Illinois electric and gas delivery utility company as of Wednesday, June 13. Mark joined Ameren in 2002.
Mark replaces Scott A. Cisel, who left the company to pursue other interests.
Richard J. Mark will be replaced in his old position by Michael L. Mohn, who has been with Ameren since 2000, after a successful career in public accounting at PricewaterhouseCoopers LLC.