Our People
Stephen Osborne
Managing Member, Sonex Aviation LLC / ON Capital, Inc.
As founder of ON Capital, Inc., Stephen focuses on investing in aviation businesses with strong products, great people, and room to grow. In May 2026, ON Capital acquired the assets of Sonex Aircraft, AeroConversions, and Sonex Aerospace, giving opportunity to carry the Sonex legacy forward while building for the future.
Stephen is a lifetime EAA member, warbird pilot, an active multi-business owner, husband to a beloved wife, and father to 5 beautiful children.
Our Staff
Cris Nash
Production Manager
Sonex Employee Since 2016
Tom Turner
Aircraft Lead Assembly Mechanic
Sonex Employee Since 2021
David Juckem
Lead Machinist
Sonex Employee Since 2026
Mark Schaible
Aircraft Designer, Sonex Aviation LLC
Sonex Employee Since 2003
Steve Severson
Purchasing and Warehouse Manager
Sonex Employee Since 2013
Piper Ellis
Warehouse Assistant
Sonex Employee Since 2026
Kory Bollinger
Machinist Technician / Pilot
Sonex Employee Since 2026
Tyler Nash
Assembly Mechanic
Sonex Employee Since 2022
Nathan Holbrook
Aircraft Assembly Mechanic / Tech Support
Sonex Employee Since 2020
Sonex Advisor Emeritus
- John Monnett
Sonex Founder
Learn More
Sonex Advisory Board
- Pete Buck
Pete Buck is one of John Monnett’s original design partners, involved in the design of the Monex racer, Moni sailplane, Sonex, Waiex and Xenos, and has a distinguished career as a Lockheed Martin Senior Fellow in Palmdale, CA. - Joe Norris
Joe Norris is a well-known EAA and Sonex staff alumnus, Sonerai II and Sonex builder who has been involved in aviation for over 40 years, and the homebuilt aircraft movement for nearly as long. Joe is a Commercial CFI, A&P/IA and DAR for EAB &LSA aircraft. - Chad Feucht
Chad Feucht is a retired Air Force F-16, F-22 and operational test pilot, former Lockheed Martin and Boeing employee who currently owns and operates a wealth management practice in neighboring Fond du Lac, WI.
John Monnett Biography
- “John Monnett: From Sonerai to Sonex”
by Jim Cunningham
This 150 page biography of Sonex founder John Monnett was written by a Sonex builder and tells the inspiring story of the history behind Sonex Aircraft and AeroConversions products. Signed Copies are available directly from the Sonex Web Store!
On February 28, 1998 John Monnett lifted-off from Wittman Regional Airport in Oshkosh, WI in a completely new aircraft: Sonex serial number 1, or “SX1.” While certainly not the beginning of John Monnett’s journey, the first flight of SX1 marked the beginning of the Sonex Story for us and thousands of others worldwide.
Our Mission
Sonex Aviation LLC is committed to providing the recreational aviation community innovative, cost-effective and efficient aircraft kits, powerplants, and accessories and supporting them with industry-leading customer service.
In addition, Sonex provides leadership to the grass-roots homebuilt community to protect the experimental-amateur built rules and cultivates new pilots and airplane builders through educational efforts.
Our Vision
To continue the Sonex heritage of Product Innovation, Affordability, Simplicity, Versatility, Performance, Engineering, and Quality and to expand these themes into a broader aviation marketplace.