10 Ameren engineering leaders
Vice president of engineering, design and project management, vice president of nuclear engineering and director of electric system planning are current titles of these ten Ameren engineering leaders. A reader can learn how engineering leaders work at Ameren from people who have held the role.
Professionals to explore
Chris Stumpf
LinkedInExperience: Vice President of Engineering, Design and Project Management · Ameren
Chris Stumpf has been Vice President of Engineering, Design and Project Management at Ameren since January 2025, based in Ballwin, Missouri. Chris Stumpf was Sr. Director - Engineering Design & Project Management at Ameren from 2019 to 2025, Director Project Management, Mechanical & Environmental Engineering there from 2018 to 2019 and Sr. Manager, Project Engineering there from 2017 to 2018.
Ellen Prinster
LinkedInExperience: Director, Transmission & Distribution Line Design · Ameren
Ellen Prinster has been Director, Transmission & Distribution Line Design at Ameren since July 2026. Ellen Prinster was Senior Manager, Transmission Electrical Design at Ameren from 2025 to 2026, Manager, Project Management there from 2023 to 2025, Supervising Engineer there from 2021 to 2023 and Engineer & Transmission Chief of Staff there from 2019 to 2021.
Greg Vasel
LinkedInExperience: Director, Generation Engineering and Construction · Union Electric Co (d/b/a Ameren Missouri)
Greg Vasel has been Director, Generation Engineering and Construction at Union Electric Co (d/b/a Ameren Missouri) since April 2023. Greg Vasel was Director, Labadie Energy Center at Ameren from 2016 to 2023 and Operations Manager - Labadie Energy Center at Ameren from 1994 to 2023, both at the same energy center.
Jackie Becker
LinkedInExperience: Vice President Engineering & Construction · Ameren
Jackie Becker has been Vice President Engineering & Construction at Ameren since October 2023 and has also held the title Vice President Energy Delivery at Union Electric Co (d/b/a Ameren Missouri) since June 2026. Jackie Becker was Senior Director Transmission Operations and Maintenance at Ameren from 2021 to 2023 and Director Portfolio Management, Planning and Project Controls there from 2019 to 2021.
Jason Woodard
LinkedInExperience: Director, Metro Engineering · Ameren
Jason Woodard has been Director, Metro Engineering at Ameren since July 2026, based in St. Louis, Missouri. Jason Woodard was Director, Electrical Design and Metro Engineering at Ameren from 2024 to 2026, Director - Gateway Division there from 2021 to 2024 and Supervising Engineer there from 2008 to 2021.
John Beck
LinkedInExperience: Vice President Nuclear Engineering · Ameren
John Beck has been Vice President Nuclear Engineering at Ameren since December 2023 and has also held the title Site Vice President there since July 2025, and the profile headline names the Callaway Nuclear Energy Center. John Beck was Senior Director Outages at Ameren from 2022 to 2023, Director of Engineering there from 2021 to 2022 and Power Plant Director there from 2019 to 2022.
Kiran Thammineni
LinkedInExperience: Director, Integrated System Planning · Ameren
Kiran Thammineni has been Director, Integrated System Planning at Ameren since August 2026 and has also held the title Supervising Engineer there since September 2019. Kiran Thammineni was Manager, Integrated Transmission Planning at Ameren from 2025 to 2026, Transmission Operations Supervisor there from 2018 to 2019 and Consulting Engineer there from 2012 to 2018.
Langston Rose
LinkedInExperience: Director, Electric Operations and Engineering · Ameren Illinois
Langston Rose has been Director, Electric Operations and Engineering at Ameren Illinois since December 2023, based in Belleville, Illinois. Langston Rose was Director, Gas Operations at Ameren Illinois from 2021 to 2023, Electric Operations Superintendent at Ameren Illinois from 2018 to 2021 and Supervising Engineer at Ameren from 2015 to 2018.
Ryan Niemerg
LinkedInExperience: Director - Electric System Planning · Ameren Illinois
Ryan Niemerg has been Director - Electric System Planning at Ameren Illinois since June 2025, based in Decatur, Illinois. Ryan Niemerg was Director - Illinois T&D Design at Ameren Illinois from 2023 to 2025, Senior Manager - Substation Design Engineering there from 2022 to 2023 and Senior Manager, Distribution Planning & Reliability there from 2019 to 2022.
Todd Witt
LinkedInExperience: Director Engineering Design & Regulatory Affairs · Ameren
Todd Witt has been Director Engineering Design & Regulatory Affairs at Ameren since June 2024, based in Jefferson City, Missouri. Todd Witt was Manager Regulatory Affairs at Ameren from 2022 to 2024, Operations Supervisor - Licensed there from 2016 to 2022 and Licensing Engineer there from 2013 to 2016.
Choose the right perspective
Pick the person whose own engineering area is closest to your question, since design and project management, nuclear engineering, system planning, line design and generation engineering each give a different view. Check the dates on each role to see how current the experience is.
Questions to take into the conversation
- 01What took most of your time in your current engineering role, and how did you decide what to handle yourself?
- 02How did you balance reliability work on the existing system against new capital projects?
- 03What did you carry over from earlier roles that changed how you lead engineering teams?
Reaching Ameren engineering leaders
How can I contact one of these Ameren engineering leaders?
Pick one of the 10 people on this page and choose "Book a paid call", or describe your project to find others. You offer a fee for a 15-minute call or a written answer, Instant Expert finds the person's work email and sends the invitation, and they decide whether to accept. The list covers 3 companies: Ameren, Union Electric Co (d/b/a Ameren Missouri) and Ameren Illinois, based on profile data retrieved on October 19, 2026. Being listed here doesn't mean someone has agreed to take calls.
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About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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