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In the academic world, he lectured at the Institute of St. Denys, Paris, France, from 1949 to 1950. From 1952 to 1962, he taught at the Three Hierarchs Seminary in Villemoisson, France. He was a Professor at the Catholic University in Paris from 1966 to 1978. He was Adjunct Professor of Canon Law at [[St. Vladimir's Orthodox Theological Seminary (Crestwood, New York)|St. Vladimir's Seminary]], Crestwood, New York, since 1979. As a specialist in Orthodox Canon Law, Archbishop Peter occupied prominent positions. His final book, published by St. Vladimir's Press, urged the updating Orthodox Churches to adopt the Western Christian calculation of the Orthodox Easter, aka [[Paschalion]] based on . This has been a controversial topic for some time in Eastern Orthodoxy circles. Some critics of Archbishop Peter's book, and others in its vein, emphasize that only the extant evidence from Eastern Paschalion holds to the Nicene Council 's 4th century prohibition of Acelebrating the Resurrection before the Jewish Passover.D. 325Some even argued that abandonment of that stipulation implies a subtle subtext of anti-Semitism, since it would further decouples the connection between Christianity and Judiasm from a historical perspective as well as ignore contemporary Jews' calculation Passover.