Bishop Andonios was elected on December 11, 2001 by the Holy and Sacred Synod of the Ecumenical Patriarchate of Constantinople as an Auxiliary Bishop of the Greek Orthodox Archdiocese of America. He was given the title of Bishop of Phasiane, an ancient Diocese in Pontos, the birthplace of his grandparents. His episcopal ordination took place at the Archdiocesan Cathedral of the Holy Trinity in New York on Saturday, February 23, 2002.

Born and raised in Jersey City, New Jersey, the middle child of Steven and Despina Poulos (Paropoulos), he grew up in the local St. Demetrios parish. In 1976, he entered Holy Cross School of Theology in Brookline, Mass., graduating in 1979 receiving a M. Div with Distinction and as President of the graduating class. After serving at various Archdiocesan institutions for five years in a lay capacity, he was ordained a Deacon on August 18, 1985 at the Archdiocesan Cathedral of the Holy Trinity by the late Archbishop Iakovos. He served for almost 4½ years as Deacon to the Archbishop until December 3, 1989, when he was ordained to the Holy Priesthood. 

Following his ordination, he continued to serve in both the Office of the Archbishop and the Office of the Chancellery and was Assistant Chancellor and Personnel Director of the Greek Orthodox Archdiocese of North and South America.  On February 24, 1991, he was elevated to the rank of Archimandrite.  After a sabbatical in Greece from 1991-1992, he returned to the Archdiocese and was subsequently assigned to the parish of Zoodohos Peghe in the Bronx until 1995.  At that time, he returned to the Archdiocese to assist with the retirement of Archbishop Iakovos and also assumed the position of Coordinator for the 1996 Clergy-Laity Congress, which was held in New York.  In July of that year, he was appointed Director of St. Michael's Home in Yonkers, NY, where he continues to serve as Director, and in June 2000, Archbishop Demetrios appointed him to the new position of Director of the Archdiocesan Department of Philanthropy.

Archbishop Demetrios of America, in consultation with the Holy Eparchial Synod, appointed His Grace to be the Chancellor of the Greek Orthodox Archdiocese of America, effective October 1, 2009.

Name day: January 17

Members of the Holy Eparchial Synod

His Eminence Archbishop Elpidophoros of America

Consecration date: March 1, 2011
Name day: November 2

His Eminence Metropolitan Methodios of Boston

Consecration date: April 8, 1984
Name day: June 14

His Eminence Metropolitan Isaiah of Denver

Consecration date: May 25, 1986
Name day: May 9

His Eminence Metropolitan Alexios of Atlanta

Consecration date: May 17, 1987
Name day: March 17

His Eminence Metropolitan Nicholas of Detroit

Consecration date: April 3, 1999
Name day: December 6

His Eminence Metropolitan Savas of Pittsburgh

Consecration date: February 2, 2002
Name day: December 5

His Eminence Metropolitan Gerasimos of San Francisco

Consecration date: February 9, 2002
Name day: October 20

His Eminence Metropolitan Apostolos of New Jersey

Consecration date: December 20, 2014
Name day: June 30

His Eminence Metropolitan Nathanael of Chicago

Consecration date: March 17, 2018
Name day: June 11
Auxiliary Bishops

His Grace Bishop Demetrios of Mokissos

Greek Orthodox Archdiocese of America
Consecration date: December 9, 2006
Name day: October 26

His Grace Bishop Sevastianos of Zela

Greek Orthodox Archdiocese of America
Consecration date: December 6, 2011
Name day: December 18

His Grace Bishop Joachim of Amissos

Greek Orthodox Archdiocese of America
Consecration date: December 22, 2019
Name day: September 9

His Grace Bishop Spyridon of Amastris

Greek Orthodox Archdiocese of America
Consecration date: November 14, 2020
Name day: December 12

His Grace Bishop Timothy of Hexamilion

Greek Orthodox Archdiocese of America
Consecration date: December 5, 2020
Name day: January 22

His Grace Bishop Ioannis of Phocaea

Greek Orthodox Archdiocese of America
Consecration date: December 19, 2020
Name day: January 7

His Grace Athenagoras of Nazianzos

Greek Orthodox Archdiocese of America
Consecration date: June 5, 2021
Name day: July 24

His Grace Bishop Constantine of Sassima

Greek Orthodox Archdiocese of America
Consecration date: October 15, 2022
Name day: May 21
Former Archbishops

His Eminence Spyridon

Greek Orthodox Archdiocese of America
Consecration date: November 5, 1985
Name day: December 12

His Eminence Demetrios

Consecration date: September 17, 1967
Name day: October 26
Retired Bishops

His Eminence Metropolitan Dimitrios of Xanthos

Greek Orthodox Archdiocese of America
Consecration date: May 31, 1998
Name day: October 26

His Grace Bishop Andonios of Phasiane

Greek Orthodox Archdiocese of America
Consecration date: February 23, 2002
Name day: January 17
Metropolises & Hierarchs