Russian State University for the Humanities
In 1949, he began teaching at the Moscow Historical Archives Institute (now part of the Russian State University for the Humanities). He received his Doctor of Historical Sciences in 1965 and became an Honorary Doctor RSUH in 1970, attaining the title of 'Professor'. At the same time, starting in 1956, he worked in the Institute of History of Sciences of the USSR (now Institute of Russian History at RAS).