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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 Orthodox Churches to adopt the Western Christian calculation of Easter, aka [[Paschalion]]. This has been a controversial topic for some time in Eastern Orthodox circles. Some critics of Archbishop Peter's book, and others in its vein, emphasized that only the Eastern Paschalion holds to the Nicene Council's 4th century prohibition of on celebrating the Resurrection before the Jewish Passover. Some argued that abandonment of that stipulation implies a subtle subtext of anti-Semitism, since it would further decouple the connection between Christianity and Judiasm. This criticism is made on both historical and contemporary grounds, the latter being that Western Christianity annually ignores contemporary Jews' calculation of Passover.