'''The Rev. Dr. John Chryssavgis''' is an author and [[theologian]] who serves as advisor to the [[Ecumenical Patriarch]] on environmental issues. He is a [[clergy]]man of the [[Greek Orthodox Archdiocese of America]]. In January 2012, he became received the title of Archdeacon of the Ecumenical Throne by [[Bartholomew I (Archontonis) of Constantinople|His All-Holiness Ecumenical Patriarch Bartholomew]].