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He was [[ordination|ordained]] a [[deacon]] in London on [[August 28]], 2007, by [[Bishop]] [[Elisey (Ganaba) of Sourozh|Elisey of Bogorodsk]], serving in the [[Diocese of Sourozh]].
In January 2010, Archbishop [[Kyrill (Dmitrieff) of San Francisco|Kyrill of San Francisco and Western America]] received Deacon Matthew Steenberg into the ranks of clergy of the Western American Diocese from the Diocese of Sourozh and assigned him to the St. Tikhon of Zadonsk Church in San Francisco and as the new principal of St. John of San Francisco Orthodox Academy in San Francisco<ref>[http://webcache.googleusercontent.com/search?q=cache:ShuMKn4LJA0J:frsergei.wordpress.com/2010/03/11/what-is-your-name-brother/+Steenberg+monk+March+8+2010&cd=8&hl=ru&ct=clnk&gl=ru Fr. Sergei SveshnikovWhat is Your Name, Brother?]</ref><ref name=wadiocese>http://www.wadiocese.com/enews.php?id=C50_99_14</ref>.
On [[March 8]], 2010, he was [[tonsure]]d a [[monk]] with the name [[Irenaeus]] (for St. [[Irenaeus of Lyons]]) by Archbishop Kyrill of San Francisco and Western America<ref name=wadiocese/>.