He was born in 1936 in a Catholic family from Great Britain.
At the age of 18 he took monastic vows in the Benedictine Order. In 1950s he served as a missionary in Calcutta. He read lectures in atholic schools in Brazil and the USA.
In 1993 hieromonk Joachim (Parr) established the St. Mary of Egypt Monastery at the Mercy House in Lower Manhattan. Fr Joachim's primary goal was to serve the needs of the inner-city poor.
In 1995 the community opened a small chapel for a wide range of divine services.
Hieromonk Joachim was an ardent advocate of ROCOR’s reunion with the Moscow Patriarchate. In early 2000 he was in charge of foreign affairs of the Russian Orthodox Church Outside of Russia (ROCOR).
In 2001 his monastery was included in the Patriarchal Parishes of the Moscow Patriarchate in the United States.
In 2008 the community bought a land plot in Treadwell, New York, and founded the Savior’s Desert Monastery.