Being a citizen with a noble origin in Saint Petersburg, Evreinov was a member of the Foreign Affairs department of the Russian nation before his conversion to the Catholic faith and ordination to the priesthood.
Following her own conversion, Hélène Iswolsky regularly attended the Divine Liturgy at the Church of the Holy Trinity, which was located near the Porte d'Italie in Paris.
Among the congregation were famous people: the writer Nadezhda Lappo-Danilevsky, Baron Mikhail Taube, director D. Aristov, Colonel Michael A. Yudin-Belsky, Zoya Kamlyuhina and others.
In 1932, at the initiative of the parish there Evreinov founded the Brotherhood of Saint Nicholas the Wonderworker, in Paris, which every third Sunday of the month suit reading the reports, and to do special prayers and Fellowship of Prayer for the Church communion, which continued the tradition of Moscow's joint Orthodox-Catholic spiritual meetings on the subject of church unity, pledged thanks to the initiative of the Patriarch of All Russia Tikhon Belavin and Exarch of Russian Catholics of Byzantine Rite Archpriest Leonid Feodorov.
Evreinov ordained many in the Russian apostolate, such as: Andrei Katkov, Cyril Kozina, Henri Petitjean, Andrew Sterpin, Theodore Romzha and others.
In Rome, Evreinov also continued his Catholic evangelism within the Russian diaspora, as the first and second wave, during which he helped the writer Boris Nikolaevich Shiryaev, poet Vyacheslav Ivanov, Leonid Brailovsky, and his wife Rimma.
On 5 June 1952 the archbishop consecrated a new altar, donated by Slovak Catholics of the United States of America and Canada, in the Roman Basilica of Saint Clement.
Evreinov died on 20 August 1959 in Rome and lies buried in the Greek Byzantine Catholic Church's monastery founded by St. Nilus of Rossano in Grottaferrata.