Mitrokhin studied 1902-1905 at the Moscow College of Painting and 1905-1906 in
private studios. 1904-1905 and 1907-1908 he worked in the Murava
art-workshop. In 1918-1923 he was curator of the graphic departement of the Russian Museum in Petrograd. In 1919-1923 he taught at the College for
Photography and 1924-1930 at the Vkhutein. 1932-1939 he was president of the graphic section of the Artist's Association of Leningrad.