Ameren's Executive Leadership 

Thomas R. Voss 

Ameren Corporation
Chairman of the Board
and Chief Executive Officer

Thomas R. Voss was elected to the position of chairman of the board of directors of Ameren Corporation on April 27, 2010. He was elected president and chief executive officer of Ameren in May 2009 - titles he retained with his promotion to the position of board chairman. (more)


Warner L. Baxter

Ameren Corporation
Warner Baxter is president of Ameren Corporation and will become its chief executive officer on April 24, 2014. From 2009 to early 2014, he served as president and CEO of Ameren Missouri, the largest energy provider in Missouri, serving more than 1.2 million electric and gas customers with revenues in excess of $3 billion. (more)
Richard J. Mark
Ameren Illinois Chairman, President and Chief Executive Officer
Richard J. Mark is chairman, president and CEO of Ameren Illinois Company. In this position, he is responsible for the natural gas and electric delivery business, customer service, gas support and community affairs for Ameren Illinois. (more)


Daniel F. Cole

Ameren Services Chairman, President and
Chief Executive Officer
Daniel F. Cole on May 1, 2009, became chairman, president and chief executive officer of Ameren Services, an Ameren subsidiary providing administrative and technical support services to Ameren and its operating companies, subsidiaries and affiliates. (more)


Maureen A. Borkowski

Chairman, President and Chief Executive Officer
Ameren Transmission Company
Ameren Transmission Company of Illinois
Maureen A. Borkowski is chairman, president and chief executive officer of Ameren Transmission Company (ATX) - a subsidiary dedicated to electric transmission infrastructure investment. In addition to leading the development of new transmission, she is also responsible (more)



Mary P. Heger

Ameren Services Vice President and Chief Information Officer, Information Technology and Ameren Services Center
Mary P. Heger is vice president and chief information officer (CIO) of Information Technology and the Ameren Service Center for Ameren Services, a subsidiary of Ameren Corporation. She directs the staff responsible for all IT application development, infrastructure, networks, payroll, bill processing and accounts payable. (more)

Mark C. Lindgren

Ameren Services Vice President 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, including benefits, compensation, employee relations, hiring, leadership and organizational development. (more)


Martin J. Lyons

Ameren Executive Vice President and
Chief Financial Officer
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)


Michael L. Moehn

Ameren Missouri Chairman, President and
Chief Executive Officer  
Michael Moehn is chairman, president and chief executive officer for Ameren Missouri. Prior to this role, Moehn was named senior vice president, Customer Operations, Ameren Missouri, where he was responsible for electric and gas distribution and customer Service operations to more than 1.2 million customers. (more)


Charles D. Naslund

Ameren Services Executive Vice President
Corporate Oversight
Charles D. Naslund is executive vice president, Corporate Oversight - a position he assumed on March 1, 2013. He also serves as executive vice president, Generation and Environmental Projects for Ameren Missouri. (more)


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, security and economic development functions for the corporation. (more)


executive leadership, executives, executive leaders, senior management, Ameren senior management
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