Ameren Corporation (AEE) is a St. Louis-based, Fortune 500 company that powers the quality of life for millions of people throughout Illinois and Missouri. 

Utilities

Ameren

Gwen Mizell is currently the Chief Sustainability & Diversity Officer at [Ameren](/org/ameren). Gwen has extensive experience in the energy industry, having served in various leadership roles at [Westinghouse](/org/westinghouse) Electric Company, ABB’s Enterprise Software Product Group, GSM Development, and [Calpine](/org/calpine).

Mizell began their career at [Westinghouse](/org/westinghouse) Electric Company in 1986 as part of the Sales and Marketing Leadership Development Program. Gwen quickly rose through the ranks, becoming a Senior Marketing Engineer/Environmental Engineer in 1988. In 1999, they left [Westinghouse](/org/westinghouse) to join ABB’s Enterprise Software Product Group as Manager Deregulated Energy Market Services.

In 2002, Mizell joined [Calpine](/org/calpine) as Director of Business Development. Gwen held this position until 2006 when they left to become Vice President at DNV KEMA. Mizell was responsible for power generation business development in the Americas during their time at DNV KEMA.

In 2009, Mizell left DNV KEMA to become President and CEO of GSM Development, a technical energy consulting firm. Gwen held this position until 2015 when they joined [Ameren](/org/ameren) as Chief Sustainability & Diversity Officer.

Gwen Mizell has a professional certification in Strategic Diversity and Inclusion from [Georgetown University](/org/georgetown-university). Gwen also has a Master of Science in Management and Public Policy Analysis from [Carnegie Mellon University](/org/carnegie-mellon-university). Gwen has also attended the APPAM Summer Institute at Harvard Kennedy School. Gwen has a Bachelor of Science in Materials Science Engineering from the [University of Alabama at Birmingham](/org/university-of-alabama-at-birmingham) and a degree in Chemical Engineering from the [Georgia Institute of Technology](/org/georgia-institute-of-technology).

Their manager is Martin J. Lyons, President & CEO. Gwen Mizell works with Shawn E. Schukar - Chairman & President, [Ameren](/org/ameren) Transmission, Fadi M. Diya - SVP, [Ameren](/org/ameren) Missouri & Chief Nuclear Officer, and Richard J. Mark - Chairman & President, [Ameren](/org/ameren) Illinois.

Gwen Mizell

Richard J. Mark is the current Chairman & President of Ameren Illinois. Prior to this, they were the President and CEO of Ancilla Systems, Inc. from January 1990 to December 2002. Richard was assigned to St. Mary's Hospital in East St. Louis during their tenure there.

Richard J. Mark has a degree from [Iowa State University](/org/iowa-state-university) and they have completed a certified reactor technology course for utility executives from the Massachusetts Institute of Technology. Richard also has certifications from ExecRank in assessing and reducing cybersecurity risk at the board level, from the NACD in completion of various governance and fiduciary board curriculum courses, and from ExecRank in the board’s responsibilities when interpreting financial statements.

Some of their coworkers include Mark C. Lindgren - SVP, Corporate Communications & CHRO, Chonda Nwamu - SVP, General Counsel & Secretary, and Michael L. Moehn - EVP, CFO & President, Ameren Services. Richard J. Mark reports to Martin J. Lyons, President & CEO.

Richard J. Mark

Shawn E. Schukar is the Chairman & President of [Ameren](/org/ameren) Transmission at [Ameren](/org/ameren). Prior to this, they served as the Senior Vice President of [Ameren](/org/ameren) Energy Marketing (AEM) from November 2011 to December 2014. During their time at AEM, Shawn directed $1.2B of energy and energy services sales (5500 MW of gas and coal generation) with 75-person marketing, sales, trading, operations, and asset management team to improve profitability and market share. Some of their accomplishments include improving operational capabilities and optimization of assets within commercial and generation groups, which supported a $300M improvement in cash flows during a period of 20% drop in market prices. Additionally, they led strategic efforts with state/federal organizations which delayed $420M capital spend by 6 years. Shawn also expanded commercial and industrial customers by 39% (550+ companies) while increasing sales 15% and retaining 85%+ of existing customers.

Before their time at AEM, Shawn served as the Vice President of Strategic Initiatives at [Ameren](/org/ameren) Services from January 2008 to November 2011. In this role, they were responsible for leading the development and execution of [Ameren](/org/ameren)’s corporate strategy. Shawn also oversaw the company’s merger and acquisition activities, as well as business development initiatives. Shawn has a proven track record in developing and executing successful strategies that create shareholder value. Shawn is a dynamic leader with a passion for driving results.

Shawn E. Schukar has an MBA in Accounting and Finance from Gies College of Business - University of Illinois Urbana-Champaign and a Bachelor of Science in Mechanical Engineering from University of Illinois Urbana-Champaign.

Their manager is Martin J. Lyons, President & CEO. They are on a team with Mark Birk - Chairman & President, [Ameren](/org/ameren) Missouri, Richard J. Mark - Chairman & President, [Ameren](/org/ameren) Illinois, and Chonda Nwamu - SVP, General Counsel & Secretary.

Shawn E. Schukar

Bhavani Amirthalingam is currently the SVP and Chief Digital Information Officer at [Ameren](/org/ameren). Prior to this, they served as the CIO for North America at [Schneider Electric](/org/schneider-electric), where they were responsible for leading the company's transformation efforts, including digitizing the manufacturing and supply chain operations. Bhavani also served as a coach for Coach FLL Teams from 2011 to 2014. From 1999 to 2015, they were the VP of Customer Solutions and Innovation at [World Wide Technology](/org/world-wide-technology). Bhavani began their career as a Senior Consultant for eCommerce at Sony.

Bhavani Amirthalingam has a Bachelor's degree in Computer Science from the University of Madras, an MBA in Information Management from SPJIMR SP Jain Institute of Management & Research, and has completed executive programs in Exponential Thinking from [Singularity University](/org/singularity-university) and Governance: Succeeding as a Corporate Director from [Harvard Business School](/org/harvard-business-school) Executive Education.

Bhavani Amirthalingam reports to Martin J. Lyons, President & CEO. Some of their coworkers include Gwen Mizell - Chief Sustainability & Diversity Officer, Mark Birk - Chairman & President, [Ameren](/org/ameren) Missouri, and Shawn E. Schukar - Chairman & President, [Ameren](/org/ameren) Transmission.

Bhavani Amirthalingam

Mark C. Lindgren is currently the SVP, Corporate Communications & CHRO at [Ameren](/org/ameren). Mark has been with [Ameren](/org/ameren) since January 1998 and has served in various roles including VP, Corporate HR. Prior to joining [Ameren](/org/ameren), Mr. Lindgren was with AIG from January 1994 to December 1998 as the Manager, Compensation, MEM, HRIS and Payroll. From January 1989 to December 1994 they worked for various companies in marketing and administrative roles.

Mark C. Lindgren has a BS in Marketing and Administrative Management from [Eastern Illinois University](/org/eastern-illinois-university), an MBA from [University of Illinois Springfield](/org/university-of-illinois-springfield), and a Certificate in Advanced Management Program (AMP) from University of Chicago. Mark also has a Certificate in Nuclear Reactor Technology from Massachusetts Institute of Technology.

They work with Chonda Nwamu - SVP, General Counsel & Secretary, Gwen Mizell - Chief Sustainability & Diversity Officer, and Shawn E. Schukar - Chairman & President, [Ameren](/org/ameren) Transmission. Mark C. Lindgren reports to Martin J. Lyons, President & CEO.

Mark C. Lindgren

J. Edward Coleman is the current director at [Ameren](/org/ameren). Prior to this, they were a board member at Lexmark International, Inc. from July 2010 to November 2016. J. was also the chairman and CEO at [Unisys](/org/unisys) from October 2008 to December 2014. Coleman is known for their leadership skills and accomplishments during their tenure at [Unisys](/org/unisys). J. is also well respected by their peers for their work in turnaround situations.

J. Edward Coleman received their MBA in marketing from Indiana University Bloomington and their BA in economics from William & Mary.

J. Edward Coleman

Chonda Nwamu is Senior Vice President, General Counsel & Secretary for [Ameren](/org/ameren) Corporation. Nwamu is the primary legal advisor to [Ameren](/org/ameren)'s Board of Directors and senior management, and she leads the General Counsel function, which includes the company's legal, corporate governance, federal regulatory and legislative affairs, and enterprise ethics and compliance departments. She also serves on [Ameren](/org/ameren)'s Executive Leadership Team as a contributor to overall strategic direction of the Company.
Nwamu joined [Ameren](/org/ameren) Services Company in 2016 as vice president and deputy general counsel of the legal department, and was promoted to senior vice president in 2019. In the deputy general counsel role, she led Legal Department strategy and operations, and oversaw the department’s various practice areas including regulatory, transactional, environmental, labor and employment, and litigation and claims.

Prior to joining [Ameren](/org/ameren), Nwamu practiced law at a California investor-owned electric and gas utility. During her 16 year tenure at the California energy utility, she served in a variety of legal, regulatory and customer-focused roles including Managing Counsel and Senior Director. Prior to joining the California energy utility, Nwamu was in private practice at a commercial litigation law firm in Philadelphia, PA where she specialized in complex commercial litigation including pharmaceutical products liability defense.

Nwamu previously served as president of the Conference of California Public Utility Counsel. She was also selected to participate as a Fellow in the Leadership Council for Legal Diversity, and the International Women's Forum leadership programs.

Nwamu earned a Juris Doctor degree from the [University of Pennsylvania](/org/university-of-pennsylvania). She also holds a Bachelor of Arts degree in English from the [University of Virginia](/org/university-of-virginia).

Nwamu is committed to community service, and is an advocate for diversity and inclusion in the legal profession. She was appointed to the Board of Directors for BellRing Brands Inc., and also serves on the Board of Directors of the Boys and Girls Club of Greater St. Louis. She was also appointed by the Mayor of St. Louis to serve as a city Commissioner on the St. Louis Zoological Park Subdistrict Commission.

Chonda Nwamu

Mark Birk is chairman and president of [Ameren](/org/ameren) Missouri, an electric and natural gas delivery utility subsidiary of [Ameren](/org/ameren) Corporation and Missouri's largest utility. Birk has held many leadership positions in his more than 35-years at [Ameren](/org/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.
In his prior role as [Ameren](/org/ameren) Missouri's senior vice president for customer and power operations, he was responsible for the engineering, construction, operations and maintenance of [Ameren](/org/ameren) Missouri's electric and natural gas distribution systems and non-nuclear generation and energy management, as well as customer experience operations for more than 1 million electric and natural gas customers. He has been a member of [Ameren](/org/ameren)'s Executive Leadership Team since 2014.

Birk began his career with the company in 1986 supporting the Callaway Energy Center. In 1989, he joined the company’s Meramec Energy Center. In 1996, he was promoted to supervisor in transmission operations, and subsequently held a series of successively more responsible positions. He was promoted to general manager of energy delivery technical services in 2001; to vice president of energy trading in 2003; to vice president of power operations in 2005; to senior vice president, corporate strategy and enterprise risk management in 2012; and to senior vice president, corporate safety, strategy and nuclear operations oversight in 2014.

Birk has a bachelor’s degree in electrical engineering and a master of science in electrical engineering from [Missouri University of Science and Technology](/org/missouri-university-of-science-and-technology). In 2009, he earned a master of business administration from Washington University in St. Louis. In addition, he completed the Reactor Technology Course for Utility Executives at MIT.

Mark Birk

Warner Baxter is executive chairman of St. Louis-based [Ameren](/org/ameren) Corporation, parent company of rate-regulated energy companies that serve more than 2.4 million electric and nearly 1 million natural gas customers in Illinois and Missouri. The company, which also develops regional electric transmission projects, had 2020 revenues of approximately $6 billion.
During his more than 25-year tenure at [Ameren](/org/ameren), Baxter has served in a variety of leadership roles, including chairman, president and chief executive officer of [Ameren](/org/ameren), a role he held from 2014 through 2021. He had previously served as chief financial officer and president of [Ameren](/org/ameren) Missouri.

Before joining [Ameren](/org/ameren) in 1995, Baxter served as senior manager at PricewaterhouseCoopers' national office in New York City, serving as one of the firm’s liaisons with the major accounting standard-setting bodies in the United States. From 1983 to 1993, Baxter worked in the firm’s St. Louis office, where he provided auditing and consulting services to clients in a variety of industries, including the energy industry.

Baxter earned a Bachelor of Science in accounting from the University of Missouri-St. Louis and has made meaningful and long-lasting contributions to higher education through his involvement with the [University of Missouri System](/org/university-of-missouri-system). He is a member of the University of Missouri-St. Louis Chancellors Council and the Missouri 100 advisory board.

Today, Baxter sits on several industry boards, and he is currently the vice chair of Edison Electric Institute. He serves on the board of the [Electric Power Research Institute](/org/electric-power-research-institute-inc) (past chairman of the board). Baxter also serves on the board of directors of U.S. Bancorp and [BJC HealthCare](/org/bjc-healthcare). He is a member of the board of directors of U.S. Bancorp and BJC Healthcare, and serves as vice chair of the [American Cancer Society](/org/american-cancer-society)'s Coaches vs. Cancer Council. He was past chair of Civic Progress St. Louis and now sits on the Greater St. Louis Inc. Chairman's Executive Council.

Warner L. Baxter

A strategic thinking and innovative leader with a proven track record for assembling and directing large high performing teams across a variety of disciplines ranging from Procurement to Operations in Energy and Nuclear, Mining and Metals, Automotive and Telecom. Genuine and passionate approach to leadership that drives organizations to deliver results through ongoing process improvements, forward thinking changes, and systems implementation initiatives. Fueled by a strong entrepreneurial spirit and a passion for developing people. Well balanced and collaborative manner of leadership that focuses on problem solving especially in ambiguous situations. Tremendous success in people management, fostering long-term relationships and leading all aspects of a company’s order to cash processes and supply chain/ procurement. 

Pardeep Gill

Leo S. Mackay

Cynthia J. Brinkley

Noelle K. Eder

Richard J. Harshman

Ellen M. Fitzsimmons

Steven H. Lipstein

James C. Johnson

Catherine S. Brune

Ward H. Dickson

Craig S. Ivey

Rafael Flores is the current Director at [Ameren](/org/ameren). Rafael was previously the Senior Vice President & Chief Nuclear Officer at [Luminant](/org/luminant) from March 2009 to January 2016. Prior to that, they were the Shift Supervisor at PSE&G from January 1981 to May 1983.

Rafael Flores completed their Bachelor of Science (BS) in Nuclear Engineering at [Texas A&M University](/org/texas-a-m-university).

Rafael Flores

Michael L. Moehn became Executive VP and CFO, [Ameren](/org/ameren) Corp., and President of [Ameren](/org/ameren) Services on Dec. 2, 2019. In this role, Moehn is responsible for all aspects of [Ameren](/org/ameren)'s financial affairs including Investor Relations, Financial Reporting, Accounting, Tax, Treasury and Internal Audit. He also oversees Strategy, Mergers and Acquisitions, Enterprise Risk Management, Digital Information Technology, Supply Chain and Corporate Nuclear Oversight, amongst other functions. As CFO, Moehn oversees capital allocation and capital market activities.

Michael L. Moehn

Marty Lyons was named president and chief executive officer of [Ameren](/org/ameren) and a member of the board of directors effective January 1, 2022. Lyons was previously chairman and president of [Ameren](/org/ameren) Missouri, a position he held for two years after previously serving 18 years in a variety of positions within [Ameren](/org/ameren).
As [Ameren](/org/ameren) Missouri president, Lyons led Missouri's largest investor-owned energy provider through the COVID-19 pandemic. In his time as president, he improved customer satisfaction, safety and operating performance. Lyons was elected executive vice president and CFO of [Ameren](/org/ameren) Corporation in 2009 and additionally, president of [Ameren](/org/ameren) Services in 2015. He was responsible for all aspects of [Ameren](/org/ameren)'s financial affairs including investor relations, financial reporting, accounting, tax, treasury and internal audit. He also oversaw strategy, mergers and acquisitions, enterprise risk management, digital information technology, supply chain and corporate nuclear oversight, among other functions.

As CFO, Lyons was responsible for capital allocation and capital markets activities. This included $1.1 billion of equity financing, $8 billion of debt financing and multiple credit facility extensions. During his tenure, [Ameren](/org/ameren)'s issuer credit rating at S&P and Moody's improved from BBB to BBB+ and Baa3 to Baa1, respectively. [Ameren](/org/ameren)'s market capitalization grew fourfold, which along with a 23% increase in the dividend, produced compound annual total shareholder returns of 15%.

Lyons was instrumental in the strategic decision to reposition [Ameren](/org/ameren) as a pure-play rate-regulated utility. In 2013, he led execution of the sale of the merchant generation business segment.

Lyons earned a Bachelor of Science in business administration accounting from Saint Louis University and holds a master's degree in business administration from Washington University in St. Louis. In addition, he has completed The Advanced Strategy Program at The Chicago Booth School of Business and the Reactor Technology Course for Nuclear Executives at MIT.

Before joining [Ameren](/org/ameren), Lyons was a partner with PricewaterhouseCoopers LLP. He is a member of the American Institute of Certified Public Accountants and the Missouri Society of Certified Public Accountants.

Martin J. Lyons

Fadi M. Diya

The board of directors at Ameren has a variety of experience in different industries. Some members have experience with healthcare, while others have experience in technology or nuclear engineering. All members of the board have a college education, with some members holding degrees from notable schools such as William & Mary and Indiana University Bloomington.

Board of Directors

About

Team members

Other teams at Ameren

Leadership Team

CEO and Executive Team

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