Following the war he became an instructor, teaching mineralogy in Tomsk. In 1920 he was offered a job at the Mineralogical Museum in the city of St. Petersburg.
In 1927, he led the first Soviet research expedition to investigate the Tunguska event, the largest impact event in recorded history, which had occurred on 30 June 1908. He made a reconnaissance trip to the region, and interviewed local witnesses. He circled the region where the trees had been felled and became convinced that they were all turned with their roots to the center. However he did not find any meteorite fragments from the impact.