10 Sierra Space engineering leaders
A senior VP of engineering, VPs of structures and vehicle systems, test engineering and human factors engineering, and directors of engineering, software product development, system engineering and propulsion are among these Sierra Space engineering leaders. A reader can learn how engineering leaders work at Sierra Space from people who have held the role.
Professionals to explore
Andrew Hellen
LinkedInExperience: Vice President of Electrical and Avionic Engineering · Sierra Space
Andrew Hellen was Vice President of Electrical and Avionic Engineering at Sierra Space from July 2021 to October 2024 and was Head of Electrical and Avionics at EVIO from 2024 to 2025. Andrew Hellen has been Director of Aircraft Systems at AeroTEC since September 2025 and was Vice President of Cockpit and Subsystems at Aerion Supersonic from 2018 to 2021.
Christopher Leger
LinkedInExperience: Vice President Engineering - Structures & Vehicle Systems · Sierra Space
Christopher Leger has been Vice President Engineering - Structures & Vehicle Systems at Sierra Space since August 2021, with a headline of Vice President - Space Vehicle Engineering. Christopher Leger was Director of Structures at Aerion Supersonic from 2020 to 2021 and Engineering Manager Lead Engineer at Lockheed Martin from 1997 to 2008.
Daniel Polis
LinkedInExperience: Senior Vice President of Engineering · Sierra Space
Daniel Polis has been Senior Vice President of Engineering at Sierra Space since January 2026 and was Vice President of Engineering at Sierra Space from 2023 to 2025 and Sr. Director of Engineering there from 2021 to 2023, based in Westminster, Colorado. Daniel Polis was Director of Programs, CRS2 Spacecraft at Sierra Nevada Corporation from 2020 to 2021.
Donald B.
LinkedInExperience: Director of Propulsion · Sierra Space
Donald B. has been Director of Propulsion at Sierra Space since April 2026, with a headline of Director of Hypersonics and Propulsion, based in Madison, Wisconsin. Donald B. was Sr. Manager, Programs at Sierra Space from 2025 to 2026, Lead - Stage Propulsion at Sierra Space from 2024 to 2025 and Program Manager - Propulsion from 2021 to 2024.
Grant Bovee
LinkedInExperience: Director of Engineering · Sierra Space
Grant Bovee has been Director of Engineering at Sierra Space since January 2024, with a headline of Director Engineering Services, based in Louisville, Colorado. Grant Bovee was Sr. Principle Structural Engineer at Sierra Space from 2022 to 2024 and Principle Structural Engineer at Sierra Nevada Corporation from 2009 to 2021.
Kasey Hixson
LinkedInExperience: Director of Engineering, Software Product Development · Sierra Space
Kasey Hixson has been Director of Engineering, Software Product Development at Sierra Space since September 2023 and also lists Software Test, Integration, and Labs Lead at Sierra Space since January 2023. Kasey Hixson was Spacecraft Hardware Software Integration Lead at Sierra Space from 2018 to 2023 and an Engineering Manager at GE Aerospace from 2016 to 2017.
Klint Combs
LinkedInExperience: Vice President, Test Engineering · Sierra Space
Klint Combs has been Vice President, Test Engineering at Sierra Space since May 2023 and was Senior Director of Operations, Space Transportation Systems at Sierra Space from 2021 to 2023. Klint Combs was Senior Manager, Test Engineering, Space Systems Group at Sierra Nevada Corporation from 2019 to 2022 and Senior Spacecraft Manager at Orbital ATK from 2012 to 2017.
Mike Farrar
LinkedInExperience: Sr Director of Engineering · Sierra Space
Mike Farrar has been Sr Director of Engineering at Sierra Space since March 2026 and was Director of Engineering at Sierra Space from 2024 to 2026, describing experience in engineering management, mechanical design, structural and thermal analysis, manufacturing, testing and quality. Mike Farrar was Sr. Principal Mechanical Engineer at Sierra Space from 2022 to 2024.
Therese Suaris
LinkedInExperience: Director of System Engineering · Sierra Space
Therese Suaris has been Director of System Engineering at Sierra Space since December 2022, based in Parker, Colorado. Therese Suaris was a Senior Engineering Manager at Boeing from 2012 to 2022, according to the listing, which shows those two roles.
Thomas H. Marshburn
LinkedInExperience: Chief Astronaut, VP Human Factors Engineering · Sierra Space
Thomas H. Marshburn has been Chief Astronaut, VP Human Factors Engineering at Sierra Space since January 2023, based in Pearland, Texas, and lists the role of Astronaut at NASA since 2004. Thomas H. Marshburn was a Flight Surgeon at JSC Flight Medicine from 1994 to 2004.
Choose the right perspective
Match the person's engineering area, such as structures and vehicle systems, test, software, systems engineering, propulsion, avionics or human factors, to the question you bring. Check the start and end dates of each role, since some roles listed here have ended.
Questions to take into the conversation
- 01What did you focus on first when you took on your engineering role at Sierra Space?
- 02How do design, systems and test engineers coordinate when spacecraft hardware moves toward integration?
- 03What has your own work taught you about planning test campaigns for space hardware?
Reaching Sierra Space engineering leaders
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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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