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.
Grigory Petrovich Nikulin
Yurovsky died in 1938. Before dying he wrote a warm farewell letter to his dear friend Nikulin leaving him list of documents to be delivered to Revolution Museum. From 1938 to his retirement in 1960 Nikulin worked for Department of Water and Sewerage. He was awarded with four state orders, one of which was Order of the Patriotic War 1st class (1947). During his whole life Nikulin insisted on keeping low profile concerning the killing of imperial family. He even asked Medvedev not to mention his role in killing. One year before his death he was asked by high partie official to give an interview to radio. It resulted in 3 hour recording in which he talks about everything. "All was done consciously, without doubts. I did understand all responsibility. I welcomed the decision of Ural Regional Soviet.. And even more, if it is allowed to say, I considered it as an honor."