Jane-DoH
I have no idea for sure, but here is a clue:
Gehard Fieseler in the early 1930's in Germany.
Fieseler became a leading light in European aerobatics; the aerobatic judging system he devised was the first to use coefficients of difficulty and was adopted internationally. He became the highest-paid airshow pilot in Europe, which allowed him to buy a small glider factory at Kassel. One of the first aircraft he produced was his special aerobatic machine, the Tiger, which introduced the first symmetrical airfoil (or wing section), now an essential feature of aerobatic machines.
He later went on to start a business that built FW190's during the war.
Turbine D