Tódor Kármán ( 11 May 1881 – 6 May 1963) was a Hungarian-American mathematician, aerospace
engineer, and physicist who was active primarily in the fields of aeronautics and astronautics.

He was responsible for many key advances in aerodynamics, notably on supersonic and  hypersonic  airflow characterization. He is
regarded as an outstanding aerodynamic theoretician of the 20th century.

Specific contributions include theories of non-elastic buckling, unsteady wakes in circum-cylinder
flow, stability of laminar flow, turbulence, airfoils in steady and unsteady flow, boundary layers,
and supersonic aerodynamics. He made additional contributions in other fields, including
elasticity, vibration, heat transfer, and crystallography.