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Senior Management

Ameren Illinois

Richard J. Mark

Chairman and President - Ameren Illinois

Richard Mark is Chairman and President of Ameren Illinois Companies where he is responsible for energy delivery to more than 1.2 million electric and 816,000 natural gas customers.
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Ronald D. Pate

Senior Vice President, Operations and Technical Services - Ameren Illinois

Ron Pate is Senior Vice President of Operations and Technical Services for Ameren Illinois Company (Ameren Illinois). Ameren Illinois serves 1.2 million electric and more than 816,000 natural gas customers in a 43,700-square-mile area of Illinois.
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Mary Heger

Senior Vice President Customer Experience, Ameren Illinois

Mary Heger is Senior Vice President Customer Experience of Ameren Illinois Company, a subsidiary of Ameren Corporation. Based in Collinsville, Illinois, Ameren Illinois provides service to 1.2 million electric customers and 816,000 natural gas customers across 44,000 square-miles in the state of Illinois.
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D. Scott Wiseman

Vice President, External Affairs - Ameren Illinois

D. Scott Wiseman is vice president, External Affairs for Ameren Illinois. In this role, he oversees government relations and community and public relations.
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Eric M. Kozak

Vice President, Gas Operations - Ameren Illinois

Eric M. Kozak is vice president gas operations for Ameren Illinois. Kozak is responsible for the engineering and operations of over 18,200 miles of transmission and distribution gas lines and 12 underground natural gas storage fields.
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George T. Justice

Vice President, Electric Operations - Ameren Illinois

George Justice is Vice President of Electric Operations for Ameren Illinois. As a member of Ameren Illinois' senior leadership team, Justice is responsible for the oversight of more than 50,000 miles of distribution and transmission power lines for 1.2 million customers and leading the company's electric modernization program.
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James C. Blessing

Assistant Vice President, Regulatory Policy & Energy Supply - Ameren Illinois

Jim Blessing is Assistant Vice President, Regulatory Policy and Energy Supply for Ameren Illinois. In this role, he directs power procurement, natural gas procurement, gas control, regulatory policy & rates, and Energy Efficiency for Ameren Illinois.
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Theresa M. Shaw

Vice President, Regulatory Affairs & Financial Services

Theresa Shaw is Vice President of Regulatory Affairs and Financial Services for Ameren Illinois. In this role, Theresa is responsible for leading power and natural gas procurement; energy efficiency programs; financial analysis and reporting; budgeting; regulatory affairs; regulatory policy, compliance, and strategy; and rates functions for Ameren Illinois.
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Michael G. Mueller

Vice President, Economic Development - Ameren Illinois

Michael G. Mueller has more than 32 years of energy experience with Ameren Corporation. Mueller was recently named Vice President Economic Development, Ameren Illinois.
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