Sergey Alexeyevich Chaplygin (1896—1942) was the Doctor of Applied Mathematics, the academician of the USSR Academy of Sciences, the Hero of Socialist Labor, an honored scientist of the Russian Soviet Federative Socialist Republic, a mechanic and a mathematician, one of the founders of modern aerodynamics and aeromechanics. When the WW2 started he moved to Novosibirsk with a part of the Central Institute of Aerodynamics which later formed the Siberian Aeronautical Research Institute, now named after Chaplygin.
His aerodynamics research has shaped the world aerodynamics we are used to nowadays. Many of his works served as a scientific basis for modern aero-hydrodynamics. He developed an effective method of an approximate solving of differential equations that was named after him and is used by mathematicians till today.