Early life and career
He was born Ioannis Liapis (
Greek: Ιωάννης Λιάπης, Iōánnēs Liápēs) in
 He is an
Ieronymos holds degrees in
Byzantine studies, and
theology from the
University of Athens. He has undertaken postgraduate studies at the
University of Graz, the
University of Regensburg and the
University of Munich.
 Following a stint as lector in Christian archaeology at the
Athens Archaeological Society under professor
Anastasios Orlandos, he taught as a philologist in
Lycée Léonin and he was ordained
deacon and then
presbyter in the Orthodox Church in 1967.
Ieronymos served as
Protosyncellus of the
Metropolis of Thebes and Livadeia,
abbot of the monasteries of the Transfiguration of Sagmata and
Hosios Loukas, and Secretary, later Archsecretary, of the
Holy Synod of the Church of Greece. In 1981 he was elected
Levadeia. In addition to his pastoral ministry, Ieronymos has been pursuing his work on Christian archaeology and has published two major textbooks: "Medieval Monuments of
Euboea" (1970), and "Christian
Boeotia" (2006). In 1998, he unsuccessfully contested the election to the throne of the archbishopric of Athens.
On 7 February 2008, Ieronymos was elected the new Archbishop of Athens and All Greece by the Holy Synod of the Church of Greece,
 receiving 45 out of 74 votes in a two-ballot process.
 He formally took office on 16 February 2008.
As of 2016, Ieronymos, is involved in a dispute with Patriarch
Bartholomew I of Constantinople over who has ecclesiastical authority over certain parts of Greece.
On 16 April 2016 he visited, together with
Pope Francis and Bartholomew I of Constantinople, the Mòria camp in the island of
Lesbos, to call the attention of the world to the refugee issue.