Platonov belonged to the "St. Petersburg school" of Russian historiography, which paid special attention to the study and publication of historical sources.
Platonov's scholarly career was centered on the University of St Petersburg, where he was held in highest repute for his detailed studies of the Time of Troubles (1923) and Oprichnina.
Unlike some of his disciples (such as Alexander Presnyakov), Platonov did not change his views after the Revolution and stood aloof from the mainstream Marxist historiography, as represented by Mikhail Pokrovsky.
Nevertheless, he was permitted to administer the Archaeographic Commission in 1918-29, the Pushkin House (i.e., the Russian Literature Institute) in 1925–1929 and the Academy's Library in 1925–1928.
[1] However, a number of his historical works continued to be reprinted later in the decade, and in 1967 he was formally rehabilitated.