Sergey Prokudin-Gorsky
Sergey Mikhaylovich Prokudin-Gorsky (, ;  – September 27, 1944) was a Russian chemist and photographer. He is best known for his pioneering work in colour photography and his effort to document early 20th-century Russia.
Sergey Spigelglas
Sergey Mikhailovich Spigelglas or Spiegelglass or Shpigelglas () (29 April 1897 - 29 January 1941) was acting head of the Soviet foreign intelligence service, then part of the NKVD, from February to June 1938.