Aleksey Sergeevich Malchevskiy (Russian: Алексей Сергеевич Мальчевский; 12 August 1915 – 25 July 1985) was an ornithologist from the Soviet Union who served as dean of biology at the Leningrad State University (now Saint Petersburg State University) from 1969 to 1973.
Aleksey was born to Sergey P. Malchevskiy, a professor of chemistry at Petrograd and Varvara Nikolayevna who was a graduate of the Smolny Institute.
Alexey studied biology at Leningrad State University working towards a Ph.D. on the vertebrate fauna of the Transvolga region.
His studies were interrupted by the war and he was drafted to the Leningrad Front and later in Belarus where he served as commander of an infantry platoon.
in 1958, then became a professor and guide to more than 30 students, including Roald L. Potapov and Vitaly Bianki, Jr. During the Stalinist era, Malchevskiy's assistance was sought to prove Trofim Lysenko's theory[1] that the cuckoo was not a distinct species of birds and that it was the result of changing the diet of a warbler.