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In 1949 he also became the metropolitan of the [[Ukrainian Orthodox Church in the USA]]. At the 1949 Council in New York he succeeded in bringing about unification with the eparchy of Bishop Ioan Teodorovych, who became [[Metropolitan]] of the UOC of USA. Bishop Mstyslav became his deputy and the head of the consistory. In the US, Bishop Mstyslav began extensive church activity with the Ukrainian Orthodox Center, a publishing house, library and seminary being built in South Bound Brook, New Jersey. In 1969 his authority was extended over the Ukrainian Autocephalous Orthodox Churches of Europe and Australia. During his meetings with Ecumenical Patriarch in 1963 and 1971 he brought up the issue of the canonical recognition of the Ukrainian Diaspora churches (UAOC was banned in the USSR, and hence in Soviet Ukraine at that time).

==Patriarch==