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 Botkin
Sergey Petrovich Botkin died on 12 December 1889, in Menton, France, from liver disease, which was complicated by a heart ailment.