Greason's Contributions to Commercial Spaceflight and Propulsion
The evolution of the commercial space industry has been shaped by visionaries who bridge the gap between engineering and regulation. One such figure is Greason, a professional whose career spans the development of reusable launch vehicles, the establishment of industry regulatory frameworks, and the pursuit of advanced propulsion technologies.
Key Facts
- Regulatory Influence: Worked with the FAA's Office of Commercial Space Transportation (AST) since 1998.
- Industry Leadership: Co-founded the Commercial Spaceflight Federation and XCOR Aerospace.
- Legislative Impact: Helped lead the development of the Commercial Space Launch Amendment Act of 2004.
- Entrepreneurship: Served as CEO of XCOR Aerospace (1999–2015) and Agile Aero (2015–2019).
- Academic Contribution: Teaches advanced space propulsion at the Kepler Space Institute.
Shaping the Regulatory Landscape
Greason has played a pivotal role in defining how the United States governs commercial space activity. Since 1998, he has collaborated with the FAA's Office of Commercial Space Transportation (AST), the body responsible for ensuring public safety during commercial space launches. His expertise in Reusable Launch Vehicles (RLV)—spacecraft designed to be launched and returned to Earth for multiple missions—led to his appointment to the COMSTAC (Commercial Space Transportation Advisory Committee) working group in 2000, becoming a full member in 2005.
His influence extends to federal law, where he was a leader in developing the Commercial Space Launch Amendment Act of 2004. Furthermore, in July 2003, he provided expert testimony before joint House and Senate subcommittee hearings. These hearings focused on the critical transition of suborbital vehicles from aircraft regulation to launch vehicle regulation.
Entrepreneurship and Corporate Leadership
Beyond policy, Greason has been a driving force in the private aerospace sector. He co-founded the Commercial Spaceflight Federation, originally known as the Personal Spaceflight Federation, to advocate for the industry. His early technical experience includes roles at Intel and as the engine development team lead at Rotary Rocket.
Greason is perhaps best known as a founder of XCOR Aerospace, where he served as CEO from 1999 until February 2015, subsequently transitioning to chief technologist. He remained on the board of directors until March 2016. While XCOR eventually went out of business following bankruptcy in 2017, the company served as a significant milestone in commercial space efforts.
In November 2015, Greason departed XCOR to co-found Agile Aero, a firm specializing in rapid prototyping for aerospace vehicles. He led the company as CEO until July 2019, at which point Agile Aero was acquired by Electric Sky.
Advancements in Space Propulsion and Policy
Greason's commitment to the future of humanity in space is evident in his work on policy and theoretical physics. On May 7, 2009, he was appointed to the Review of United States Human Space Flight Plans Committee, leading to numerous presentations on space settlement and policy.
He continues to contribute to the scientific community through the Tau Zero Foundation blog, where he writes about interstellar propulsion. In May 2019, he proposed a novel approach to space propulsion. This concept involves exchanging momentum with surrounding space plasma—such as the interstellar medium or solar wind—to expel reaction mass while retaining kinetic energy to accelerate a vehicle.
Since the summer of 2020, he has shared this expertise by teaching an online course on advanced space propulsion through the Kepler Space Institute.
Career Summary
| Period | Organization/Role | Key Contribution |
|---|---|---|
| 1998–Present | FAA AST / COMSTAC | Regulatory development and RLV advisory |
| 1999–2015 | XCOR Aerospace | Founder and CEO |
| 2004 | Legislative Leadership | Commercial Space Launch Amendment Act |
| 2015–2019 | Agile Aero | Founder and CEO (Acquired by Electric Sky) |
| 2020–Present | Kepler Space Institute | Instructor for Advanced Space Propulsion |
Frequently Asked Questions
What was Greason's role in the Commercial Space Launch Amendment Act of 2004?
Greason was one of the leaders involved in the development of this act, which helped shape the legal framework for commercial space launches in the United States.
What is the propulsion concept Greason proposed in 2019?
He authored a proposal for a propulsion system that accelerates a vehicle by exchanging momentum with space plasma, such as the solar wind or interstellar medium, allowing the vehicle to expel reaction mass while retaining kinetic energy.
What happened to XCOR Aerospace?
After Greason's departure and resignation from the board in 2016, XCOR Aerospace went out of business in 2017 following bankruptcy.
What is the focus of Agile Aero?
Agile Aero focused on developing rapid prototyping capabilities for aerospace vehicles before it was acquired by Electric Sky in 2019.
Where can one find Greason's current educational contributions?
Starting in the summer of 2020, Greason began teaching an online course on advanced space propulsion through the Kepler Space Institute.