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Mark Birk is chairman and president of Ameren Missouri, an electric and natural gas delivery utility subsidiary of Ameren Corporation and Missouri's largest utility. Birk has held many leadership positions in his more than 35-years at Ameren, including progressively more responsible roles overseeing customer and power operations, energy delivery, strategic planning, energy trading, enterprise risk management, safety and nuclear corporate oversight.

In his prior role as Ameren Missouri's senior vice president for customer and power operations, he was responsible for the engineering, construction, operations and maintenance of Ameren Missouri's electric and natural gas distribution systems and non-nuclear generation and energy management, as well as customer experience operations for more than 1 million electric and natural gas customers. He has been a member of Ameren's Executive Leadership Team since 2014.

Birk began his career with the company in 1986 supporting the Callaway Energy Center. In 1989, he joined the company’s Meramec Energy Center. In 1996, he was promoted to supervisor in transmission operations, and subsequently held a series of successively more responsible positions. He was promoted to general manager of energy delivery technical services in 2001; to vice president of energy trading in 2003; to vice president of power operations in 2005; to senior vice president, corporate strategy and enterprise risk management in 2012; and to senior vice president, corporate safety, strategy and nuclear operations oversight in 2014.

Birk has a bachelor’s degree in electrical engineering and a master of science in electrical engineering from Missouri University of Science and Technology. In 2009, he earned a master of business administration from Washington University in St. Louis. In addition, he completed the Reactor Technology Course for Utility Executives at MIT.