Ameren's Executive Leadership

View our Board of Directors and Corporate Officers. (more)
Warner Baxter

Warner L. Baxter

Chairman, President and Chief Executive Officer
Ameren Corporation

Warner Baxter is chairman, president and chief executive officer of St. Louis-based Ameren Corporation, parent company of rate-regulated energy companies that serve more than 2.4 million electric and 900,000 natural gas customers in Illinois and Missouri. (more)

Richard Mark

Richard J. Mark

Ameren Illinois Chairman and President

Richard J. Mark is chairman and president of Ameren Illinois Company. He is responsible for electric and natural gas distribution to more than 1.2 million electric and 806,000 natural gas customers across three-quarters of the state of Illinois. (more)

Michael Moehn

Michael L. Moehn

Ameren Missouri Chairman and President

Michael Moehn was elected chairman and president of Ameren Missouri on April 1, 2014. He is responsible for Missouri's largest energy provider in serving more than 1.2 million electric and natural gas customers. (more)

Shawn Schukar

Shawn E. Schukar

Ameren Transmission Chairman and President

Shawn Schukar is chairman and president of Ameren Transmission Company of Illinois (ATXI) - a subsidiary of Ameren Corporation, dedicated to electric transmission infrastructure investment. (more)

Warner Baxter

Bhavani Amirthalingam

Senior Vice President, Chief Digital Information Officer Ameren Corporation

Bhavani Amirthalingam joined Ameren Services as senior vice president and chief digital information officer in 2018. In this role, she is focusing on accelerating Ameren's customer-centric digital innovation. (more)

Mark Birk

Mark Birk

Ameren Missouri Senior Vice President Customer and Power Operations

Mark Birk is senior vice president, Customer and Power Operations. He is responsible for the engineering, construction, operations and maintenance of Ameren Missouri's electric and gas distribution systems as well as non-nuclear generation and energy management. (more)

Fadi Diya

Fadi M. Diya

Ameren Missouri Senior Vice President and Chief Nuclear Officer

Fadi Diya is senior vice president and chief nuclear officer (CNO) for Ameren Missouri. Diya is responsible for all of Ameren Missouri's nuclear operations. (more)


Mary P. Heger

Ameren Services Senior Vice President and
Chief Information Officer

Mary P. Heger is senior vice president and chief information officer (CIO) for Ameren Services, a subsidiary of Ameren Corporation. She directs the staff responsible for all IT application development, infrastructure, networks and future business technologies. (more)

Mark Lindgren

Mark C. Lindgren

Ameren Senior Vice President, Corporate Communications
and Chief Human Resources Officer

Mark C. Lindgren is vice president of Human Resources for Ameren where he directs the staff responsible for all Human Resources, Corporate Communications and Corporate Philanthropy. (more)


Martin J. Lyons

Ameren Executive Vice President and Chief Financial Officer
Ameren Services Chairman and President

Martin J. Lyons is executive vice president and chief financial officer for Ameren Corporation. In his current position, Lyons is responsible for corporate planning, risk management, financial accounting and reporting, tax planning and compliance, treasury and investor relations functions. (more)

Greg Nelson

Gregory L. Nelson

Ameren Senior Vice President
General Counsel and Secretary

Gregory L. Nelson is senior vice president, general counsel and secretary of Ameren, where he is responsible for the legal, federal legislative and security functions for the corporation. (more)

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