Sergei Winogradsky, Ukrainian-Russian microbiologist and ecologist (d. 1953)
Sergei Nikolaievich Winogradsky (or Vinogradskiy; Ukrainian: Сергій Миколайович Виноградський; 1 September 1856 – 25 February 1953) was a Ukrainian microbiologist, ecologist and soil scientist who pioneered the cycle-of-life concept.Winogradsky discovered the first known form of lithotrophy during his research with Beggiatoa in 1887. He reported that Beggiatoa oxidized hydrogen sulfide (H2S) as an energy source and formed intracellular sulfur droplets. This research provided the first example of lithotrophy, but not autotrophy.

His research on nitrifying bacteria would report the first known form of chemoautotrophy, showing how a lithotroph fixes carbon dioxide (CO2) to make organic compounds.He is best known in school science as the inventor of the Winogradsky Column technique for the study of sediment microbes.