Father John was born and raised in Merriville, Indiana. He is the son of Stella and the late Anastasios Vlahos. Upon graduation from Merrillville High School in 1993, he enrolled at Indiana University, and in 1997 he graduated with a Bachelors Degree in Finance.
Immediately thereafter, Fr. John attended Holy Cross Greek Orthodox School of Theology in Brookline, Massachusetts and in May 2001, he graduated with a Masters of Divinity.
On June 10, 2001, in their home parish of Saints Constantine and Helen, in Merrilville, Indiana he was joined in Holy Matrimony to Tina Manolopoulos.
From July 2001 through July 2002, Father John served as Assistant Director of the St.Photios National Shrine in St. Augustine, Florida. He was ordained to the Holy Diaconate on January 27, 2002 in Merrillville, Indiana by Metropolitan Iakovos of Chicago.
In July of 2002 he was appointed Deacon to His Eminence, Archbishop Demetrios of America in which capacity he served until January 2006.
Fr. John was ordained to the Holy Priesthood by Archbishop Demetrios at the Cathedral of St. Paul in Hempstead, New York on January 21, 2006, and served as the second priest of that community for two years.
In May of 2008, His Eminence Archbishop Demetrios of America assigned Father John to the Church of the Holy Resurrection in Brookville, New York, where he served faithfully as Proistamenos for six years. On April 11th, 2010, His Eminence Archbishop Demetrios bestowed the offikion of Economos upon Fr. John.
On June 22nd, 2014, His Eminence Archbishop Demetrios, Geron of America installed Father John as the Dean of our beloved Archdiocesan Cathedral of the Holy Trinity. On that same day, His Eminence bestowed upon Fr. John the offikion of Protopresbyter.
Father John and Presvytera Tina have two daughters, Steliani and Andreana.