H.G. Dr. Youhanon Mar Dioscoros was born in Kallarackal Kaleelil family on 28 May 1964 as the son of  Mr. P. T. Mathunny Panicker & Late Mrs. Kunjamma Panicker. He is a member of St. Thomas Orthodox Valiyapally, Kundara. He obtained his B.Sc degree  from Kerala University(1984), Theological Diploma (GST) from Orthodox Seminary, Kottayam, Bachelor of Divinity (B.D) from Serampore University (1988), Master of Theology (1991) and Doctor of Theology (1995) from the Pontifical Oriental Institute in Rome. He also holds a certificate in Pastoral Counselling from Glasgow University, Scotland (1997).

He was ordained as Sub-deacon on 13 June 1987 and Deacon on 15 May 1989 and on 3 June 1989 he was ordained to the Holy priesthood by the late H.G. Geevarghese Mar Dioscorus, Metropolitan of Trivandrum Diocese. He was the director of Holy Trinity Centre for Disabled Children, Trivandrum(1990-91), Professor and Registrar of the Holy Trinity Theological College, Addis Ababa of the Ethiopean Orthodox Church (1994-1997), and the Programme Secretary, Sophia Centre, Kottayam (1997-2006).

He is currently the Professor and Dean of Studies of Orthodox Theological Seminary, Kottayam, Registrar of   Divyabodhanam-the laity theological training programme of  the Church,  Joint Secretary of  St. Thomas Orthodox Vaidika Sanghom,  Chief Editor of Malankara Sabha Monthly,  Publisher of Purohithan Quarterly, Editorial Board Member of Bethel Pathrika,  Editorial Board Member of St. Ephrem Theological Journal,  (Satna), Executive Committee Member of TLC, Thiruvalla, Member of the Joint International Dialogue between Roman  Catholic Church and Malankara Orthodox Syrian Church.He has authored five books and numerous articles and a good preacher, teacher and a retreat father.

The Malankara Syrian Christian Association met on 11 Sep 2008 at Pampakuda elected him as the bsihop along with six others. On 4 Dec 2008 His Holiness Baselius Marthoma Didymus I professed him as Ramban. On 19 feb 2009 he was ordained as bishop by H.H.Baselius Marthoma Didymus I, at St. George Orthodozx Church, Puthupally.