AEE SEC filings last scanned 22 Aug 2026, 16:50 UTC
CEO Timeline
Martin J. Lyons, Jr.Current
Jan 2022 — Present(4y 8mo)
Martin J. Lyons, Jr. was appointed President and Chief Executive Officer of Ameren Corporation, effective January 1, 2022, succeeding Warner L. Baxter.
2 source filings — click to expand
Warner L. Baxter
Apr 2014 — Jan 2022(7y 9mo)
Warner L. Baxter was appointed Chief Executive Officer of Ameren Corporation, effective April 24, 2014, succeeding Thomas R. Voss.
transition to Executive Chairman role
5 source filings — click to expand
Thomas R. Voss
May 2009 — Apr 2014(4y 11mo)
Thomas R. Voss was appointed President and Chief Executive Officer of Ameren Corporation, effective May 1, 2009, succeeding Gary L. Rainwater.
planned retirement
4 source filings — click to expand
Gary L. Rainwater
Jan 2004 — May 2009(5y 4mo)
Mr. Rainwater was appointed Chairman and Chief Executive Officer of Ameren Corp effective January 1, 2004, succeeding Charles W. Mueller.
Thomas R. Voss was appointed President and Chief Executive Officer of Ameren Corporation, effective May 1, 2009, succeeding Gary L. Rainwater.