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.
Master (Master and Margarita)
According to Barkov, one of Master's prototypes was Maxim Gorky — the most well-known proletarian writer. Barkov believes that the year of Gorky's death (1936) is the time of the events in the "Master and Margarita". However, it's not possible to date the timeline of the Moscow part of the novel.