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Executive Leadership

Warner L. 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 J. Mark

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. ( more )

Michael Moehn

Michael L. Moehn

Chairman and President, Ameren Missouri

Michael L. Moehn was elected president of Ameren Missouri on April 1, 2014. He is responsible for Missouri's largest energy provider serving more than 1.2 million electric and natural gas customers across central and eastern Missouri, including the greater St. Louis area.  
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Shawn E. Schukar

Shawn E. Schukar

Chairman and President, Ameren Transmission Company

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 )

Bhavani Amirthalingam

Bhavani Amirthalingam

Senior Vice President, Chief Digital Information Officer, Ameren Services

Bhavani Amirthalingam joined Ameren in 2018 as senior vice president and chief digital information officer. She is leading Ameren's digital transformation to deliver a differentiated customer and co-worker experience, leveraging emerging technologies to enable the grid of the future while driving operational excellence at scale. She is focused on accelerating technology solutions to enable greater safety, security, reliability and productivity at scale.   ( more )

Mark Birk

Mark C. Birk

Senior Vice President, Customer and Power Operations, Ameren Missouri

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 M. Diya

Fadi M. Diya

Senior Vice President and Chief Nuclear Officer, Ameren Missouri

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 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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Mark C. Lindgren

Mark C. Lindgren

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

Mark C. Lindgren is senior vice president of Corporate Communications and chief human resources officer for Ameren. In his current role, Lindgren is responsible for all Human Resources, Corporate Communications and Corporate Philanthropy. 
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Executive Leadership - Martin J. Lyons

Martin J. Lyons

Executive Vice President and Chief Financial Officer, Ameren Corporation | Chairman and President, Ameren Services

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 )

Gregory L. Nelson

Gregory L. Nelson

Senior Vice President, General Counsel and Secretary, Ameren Corporation

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 )