Alexander Leonidovich Chizhevsky[1] (Russian: Алекса́ндр Леони́дович Чиже́вский, IPA: [tɕɪˈʐɛfskʲɪj]; 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).[2] He was also noted for his work in "cosmo-biology", biological rhythms and hematology."[3]
Chizhevsky used historical research (historiometry) techniques to link the 11-year solar cycle, Earth’s climate, and the mass activity of peoples.[2]