Born in Vatra Dornei, Suceava County, Teodosie was the 17th child of the family of Procopie and Elisabeta Porcu.

He was tonsured a monk in December 1990 at the Crasna Monastery [ro], Prahova County, receiving the name Teodosie.

[2] On 21 February 2001, the Church Electoral College summoned by Patriarch Teoctist in Bucharest voted bishop Teodosie Petrescu to become the Archbishop of Tomis, being enthroned at the Cathedral of Saints Peter and Paul of Constanța on 8 April 2001, Palm Sunday.

[2] On 17 September 2002, he was elected Dean of the Orthodox Theology Faculty of Ovidius University, Constanța, being also re-elected in 2004 and 2008.

[2] In December 2002, Teodosie Petrescu was awarded the Order of the Star of Romania in the rank of Knight by President Ion Iliescu.