In 2003-2007 he was head of Theology & Tutor for Graduates; Fellow in Patristic Theology and Early Church History, Greyfriars Hall, University of Oxford.
He was [[ordination|ordained]] a [[deacon]] on [[August
15]] /[[August 28]] (os), 2007 in London by [[Bishop]] [[Elisey (Ganaba) of Sourozh|Elisey of Bogorodsk]]. He served as deacon for the [[Diocese of Sourozh]].
In 2007-2010 he was Chair of Theology and Religious Studies, Leeds Trinity University College.
On [[March 14]] ([[March 1]] os), 2010 hierodeacon Irenaeus was ordained a [[priest]] at the Holy Virgin Cathedral in San Francisco by Archbishop Kyrill of San Francisco and Western America.
On August 26 ([[August 13]] os), 2011 at the Divine Liturgy on the occasion of the feastday of St. Tikhon's Church in San Francisco, Archbishop Kyrill of San Francisco and Western America elevated Hieromonk Irenaeus to the rank of [[archimandrite]] and lay the [[mitre]] upon his head<ref>http://www.wadiocese.com/enews.php?id=C20_103_14</ref>.