In 1949, he began teaching at the Moscow Historical Archives Institute (now part of the Russian State University for the Humanities).

Schmidt chaired the All-Russia Society of Local Studies, the jury for the Nikolai Antsiferov Award, and served as the executive editor of "Archaeography Yearbook," Moscow's encyclopedia, as well as a number of other periodicals.

[3] Dmitry Likhachev described him as "a scholar-historian of a broad plan, and as an organizer of science, and as a mentor of young scientists, and as a public figure, dedicating a lot of time on the protection of historical and cultural monuments, manuscripts documentary heritage."

[5] Beginning in 1949, he supervised the student scientific circle of Source of national history that became, as Dmitry Likhachev said, "a school not only of science but also of civil behavior for many of its members."

Schmidt's immediate disciples, the club became one of the strongest points of attraction for students and other teachers, accumulating and enriching all of its members of collective research experience.