Mitchell
 
U-2
Superwing
 

Designer Don Mitchell built his first airplane in 1929 while still in high school. Along with sailplane designer Hawley Bowlus he founded Bowlus Sailplanes Inc. in 1937. The company produced kit planes such as the "Baby Albatross." During World War II they built CG-4A gliders for the U.S. Army.

After the war Mitchell developed sailplanes and ultralight powered gliders such as the Nimbus seires, the B-10 Motor Glider and the U-2 Superwing. 

Source: Pima Air & Space Museum & Wikipedia