Mar Theodosius studied in Baselius college, Kottayam and Mar Thoma College, Tiruvalla. After taking a degree in Science he joined Leonard Theological College and took the B. D. Degree in 1972. His ordination as 'Kasseessa' was in the year 1973. In 1980 he took a Masters Degree in Comparative Religions from Viswa Bharathi University and Doctorate from McMaster University, Hamilton, Canada in 1986. He was consecrated as Episcopa on 9th December 1989, with Mar Athanasius and Mar Coorilos.
From 1973 onwards he was in charge of several parishes Bombay, Calcutta, Toronto and Nanthancode and served as Director of Thomas Mar Athanasius Orientation Center, Manganam. On consecration as Episcopa he was given charge of Kunnamkulam - Madras Diocese. Now he is in charge of Trivandrum - Quilon Diocese.
Dr. Geevarghese Mar Theodosius is a good scholar and his books on Reform movements in Kerala, and their impact on the socioeconomic and religious life of the people have made a mark in academic circles.
