Mar Chrysostom was ordained a priest by
Benedict Mar Gregorios on 5 May 1973. He began pastoral ministry as an assistant vicar in the parishes around
Balaramapuram. Later he became parochial vicar of Venniyoor, Mulloor, Chowara, and Vizhinjam, and later still director of
St. Johns Leprosy and HIV Care Services at
Pirappancode. When the Malankara Catholic Mission in North America was inaugurated, Kalloor was appointed co-ordinator and spent time ministering in the
Archdiocese of Washington. Based at Holy Comforter-St. Cyprian parish in Washington, DC, he was a chaplain for
DC General Hospital and coordinated ministry for Syro-Malankara rite Catholics in the United States. In 1997 he was made
chorbishop.
Pope John Paul II appointed Mar Chrysostom as the second bishop of the Eparchy of Marthandom on 16 April 1998. He was ordained a bishop with the name Yoohanon Mar Chrysostom by Archbishop
Cyril Mar Baselios at Mar Ivanios Stadium, Trivandrum, on 29 June 1998. He was installed as the bishop of Marthandom on 1 July 1998 at Marthandom Cathedral. Yoohanon Mar Chrysostom was appointed the first bishop of the newly erected Eparchy of Pathanamthitta on 25 January 2010 and enthroned on 20 March 2010. He served until retiring on 7 June 2019. ==References==