William Hawley Bowlus came up in research I'm doing for a presentation of non-powered flight in California during the 1920's.
Per usual I will not repeat what's readily accessible online, but...
Chas. Lindberg and his wife Anne were very proactive in non-powered aviation in San Diego, at Point Loma and just north of there at Torrey Pines Glider Port.
Hawley Bowlus designed the "Paper Wing" which flew in 1928. He also was the configuration engineer of the Spirit of Saint Louis.
California was a rich environment for industrial design in the early 20th C. In 1934 he designed the Road Chief; the first aluminum camper trailer.
Only about 80 were produced, and the surviving examples go for mid six figures.
Airstream took the concept and invented an entire recreational sector.
Hawley Bowlus is one of my heroes in ID.
Bill