Alexander Leonidovich Chizhevsky (Russian: Алекса́ндр Леони́дович Чиже́вский, also Aleksandr Leonidovich Tchijevsky) (7 February 1897 – 20 December 1964) was a Soviet-era interdisciplinary scientist, a biophysicist who founded "heliobiology" (study of the sun´s effect on biology) and "aero-ionization" (study of effect of ionization of air on biological entities). He was also noted for his work in "cosmo-biology", biological rhythms and hematology."
Chizhevsky used historical research (historiometry) techniques to link the 11-year solar cycle, Earth’s climate, and the mass activity of peoples.
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