 He taught Lithuanian grammar that was based on an eclectic mix of previous works by August Schleicher, , Antanas Baranauskas, Kazimieras Jaunius.His apartment at the Warsaw Hotel was frequently visited by students, various activists, Lithuanian book smugglers.Kriaučiūnas became a strong supporter of "Aušra", the first Lithuanian-language periodical aimed at Lithuanians in the Russian Empire – he edited articles, donated funds, distributed physical copies.