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Risto Jääskeläinen was [[tonsure]]d as a [[monk]] with the name Ambrose and then [[ordination|ordained]] a hiero[[deacon]] and hieromonk in 1979 as a member of the brotherhood of the [[New Valamo|New Valaam Monastery]] in Heinävesi. At New Valaam, Fr. Ambrose was appointed the [[monastery]]'s financial caretaker in 1977. In 1986, he received the title of [[archimandrite]] from [[Archbishop]] Paul of Finland, and from 1986 to 1988 Fr. Ambrose was the right hand man of the monastery's [[igumen]], Archimandrite Panteleimon (now His Eminence the Most Reverend Metropolitan [[Panteleimon (Sarho) of Oulu]]).
In 1988, Fr. Ambrose was elected to be [[Bishop]] of Joensuu and [[consecration of a bishop|consecrated]] to this [[see]] by Archbishop John of Finland, Metropolitan Tikhon of Helsinki, and Metropolitan [[Leo (Makkonen) of Finland|Leo]] of Oulu. Bp. Ambrose served as Metropolitan of Oulu from
1988 to 2002, and in 2002 he was appointed to the post of Metropolitan of Helsinki.<!-- Besides his great efforts in ecumenical work, Metropolitan Ambrose is also one of the leading members of the board of directors of Tulikivi Corp. and an important member of the local Masonic Lodge. -->
Metropolitan Ambrose has written many theological writings, including ''Pyhyyden Kaipaus'' (1999) and ''Etsijän Tie'' (2001), and published several books concerning ecclesiastical history and ecumenical relations.