Bishop Samuel Mar Irenius was born on May 13, 1952. He hails from Kadamminitta in Pathanamthitta District of Kerala, India in the Major Archieparchy of Trivandrum. His parents are late K. C. Thomas and Annamma. After his High School Education in Kadammanitta, he joined the St. Aloysius Minor Seminary Trivandrum. On completing the Bachelor's degrees in Philosophy and Theology from St. Joseph's Pontifical Seminary Aluva, he was ordained priest on Dec. 22, 1978. He completed secular degrees of BA, MA, M.Phil and PhD from the University of Kerala. After being Appointed Lecturer in Mar Ivanios College, he later served as the Principal of St. John's College Anchal and retired as the Principal of Mar Ivanios College Trivandrum. From 1979 he served several parishes as a priest in Erathumpamon, Muttathukonam, Pampukala, Vattakarikkam, Kuttichal, Vengode, Manjakala, Kunnapuzha, Kalliyal, Thirumala, Chalai, Palayam, Thiruvallam, Karakulam, Kallayam, Chenckalchoola, Anchal, Thazhamel and Ozhukuparackal. Furthermore, he served as the Syncellus of the Major Archieparchy of Trivandum. He speaks Malayalam, English and Syriac.
He was appointed the Auxillary Bishop of the Major Archieparchy of Trivandrum on Jan. 25, 2010. His episcopal ordination was on March 13, 2010.
He was appointed the Coadjutor Bishop of Pathanamthitta on 10 April 2018 and on Jun 7, 2019 he became the Bishop of Pathanamthitta.
