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Executive Leadership

Mark Birk

Chairman and President, Ameren Missouri

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. ( more )

Ryan Arnold

Ameren Missouri Vice President of Energy Delivery

Ryan M. Arnold is vice president of Energy Delivery for Ameren Missouri. He leads a team of co-workers responsible for the design, construction, and maintenance of Ameren Missouri's electric energy distribution systems and the Distribution Control Office for Ameren Missouri's electrical infrastructure. ( more )

Ajay Arora

Ameren Missouri Senior Vice President, Chief Renewable Development Officer

Ajay Arora is senior vice president and Chief Renewable Development Officer of Ameren Missouri, where he is responsible for implementing Ameren Missouri's transformational generation plan to cleaner energy sources. ( more )

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 )

Tara Oglesby

Ameren Missouri Vice President of Economic, Community and Business Development

Tara K. Oglesby became Ameren Missouri's Vice President of Economic, Community and Business Development on Dec. 1, 2022. She leads a team focused on driving energy solutions, including customer renewable energy and sustainability options, clean electrification, energy efficiency, and community and economic development, to create sustainable growth for the communities Ameren Missouri serves. ( more )

Kent Scott

Site Vice President, Ameren Missouri Callaway Energy Center

Kent Scott is the site vice president for Ameren Missouri at the Callaway Energy Center. Kent is responsible for the safety and reliable operations of the Callaway Energy Center. ( more )

Warren Wood

Ameren Missouri Vice President of Regulatory & Legislative Affairs

Warren Wood joined Ameren Missouri as vice president, Legislative and Regulatory Affairs in 2010. In this role, he oversees state legislative and regulatory policy development and compliance for the company. Wood is a registered professional engineer with a background in utility infrastructure design, construction and operation, and energy policy development. ( more )

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