In 1939, he started working at Industria Aeronautica Româna (IAR), in Brasov.
There, he contributed to the design of the IAR-27, IAR-37, and IAR-80 aircraft, and in the production under license of the IAR-79 (with Savoia-Marchetti, Italy) and Bf 109 (with Messerschmitt, Germany) fighter aircraft.
He also directed the development of IAR 813, IAR 818-H and IAR 823 airplanes.
In 1945, he designed the M.R.