Leon Albert "Jake" "The Bullfrog" Swirbul[1] (March 18, 1898 – June 28, 1960), was an aviation pioneer and co-founder of Grumman Aircraft Engineering Corporation.
- ^ U.S. Marine Corps Enlistment Records. Series: Official Military Personnel Files, 1905 - 1998. Retrieved 2019-02-23 – via National Archives.