Orest Khvolson, Russian physicist and academic (b. 1852)
Orest Danilovich Khvolson or Chwolson (Russian: Орест Данилович Хвольсон) (November 22 (N.S. December 4), 1852 – May 11, 1934) was a Russian physicist and honorary member of the Soviet Academy of Sciences (1920). He is most noted for being one of the first to study the gravitational lens effect.