With Jonas Kazlauskashe founded[citation needed] the international journal for Baltic philology Baltistica in 1965 and the Chair for Baltic philology in 1973 after the murder of professor Kazlauskas.
Vytautas Mažiulis was also correspondent member of both the Mainz Academy of Sciences and Literature (Germany) and the Milanese Linguistics Society (Italy), as well as Chairman of an International Commission on Baltic-Slavonic Relations.
Works
Relations of Baltic and other Indoeuropean languages (Vilnius, 1970)
Prūsų kalbos paminklai ("Monuments of the Prussian Language" Vilnius, t. I 1966, t. II 1981, Vilnius)
Prūsų kalbos etimologijos žodynas ("Etymological dictionary of Prussian", 4 volumes, 1988-1997, Vilnius)
Prūsų kalbos istorinė gramatika ("Historical Grammar of Prussian", Vilnius, 2004)
On the Diachronic Morphology of the Slavonic and Baltic Languages (in collaboration with V. Zhuraviev, 1978, in Russian)