# Sebastian Fischer

> Sebastian Fischer is the CEO and co-founder of Wardstone, a Y Combinator Fall 2025 company developing modular interceptors for air and missile defense. He studied aerospace engineering at MIT and completed a dual MS/MBA at Harvard. His career includes planetary spacecraft work at NASA and Lockheed Martin and leadership roles at Amazon Prime Air and Cruise. His brother Tobias Fischer is Wardstone’s co-founder and CTO.

- **Role:** CEO & Co-Founder at Wardstone
- **Organizations:** Wardstone, Amazon Prime Air, Cruise, Lockheed Martin, NASA
- **Education:** Undergraduate degree in Aerospace Engineering, Massachusetts Institute of Technology, Dual MS/MBA, Harvard University
- **Known for:** Co-founded Wardstone, a Y Combinator Fall 2025 company., Wardstone reported three successful target interceptions in its automated ground demonstration during YC., His public LinkedIn profile lists the MIT Aero/Astro Admiral Luis de Florez Award for Original Thinking and Ingenuity, May 2015.

## Career timeline

- **—** — Studied aerospace engineering at MIT and interned at NASA and Lockheed Martin.
- **—** — Worked in systems engineering at Amazon Prime Air.
- **—** — Completed a dual MS/MBA at Harvard, then returned briefly to Amazon.
- **—** — Worked at Cruise in San Francisco.
- **2025** — Co-founded Wardstone with brother Tobias Fischer and joined Y Combinator Fall 2025.
- **2026** — Wardstone publicly shifted its commercial focus toward surface-based modular interceptors.

## Achievements

- Co-founded Wardstone, a Y Combinator Fall 2025 company.
- Wardstone reported three successful target interceptions in its automated ground demonstration during YC.
- His public LinkedIn profile lists the MIT Aero/Astro Admiral Luis de Florez Award for Original Thinking and Ingenuity, May 2015.
- His public LinkedIn profile lists Amazon Prime Air’s Delivery Champion Award, June 2023.
- Wardstone announced finalist selection in US Army xTech Apex Intercept.

## Latest updates

- **—** — Wardstone announced a surface-based commercial pivot after more than 80 one-to-one defense customer conversations.
- **—** — Wardstone announced finalist selection for US Army xTech Apex Intercept.
- **—** — Wardstone reported Fischer presenting its modular interceptor at the Army Demand Signal Forum in Washington, D.C.

## Links

- LinkedIn: https://www.linkedin.com/in/sebafischer/

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Profile page: https://yespress.io/sebastian-fischer
Published by YesPress — https://yespress.io
Last updated: 2026-10-11