Hungarian-American pioneer in 20th century aerodynamics who worked mostly on supersonic and hypersonic airflow.
He designed an early helicopter for the Austro-Hungarian Army during World War I.
He co-founded the NASA Jet Propulsion Laboratory in 1944.
He is of Jewish ancestry and he never married.
He was awarded the Daniel Guggenheim Medal for American engineering in 1955, two years after Charles Lindbergh received it.