[2][3][4] Sebastian Tudu Marino was born in Changura, a village of Gaibandha District, on June 17, 1967.
[5] He earned a Bachelor of Arts degree from there while living at St. Joseph's Minor Seminary.
[6] He earned a doctoral degree in missiology at Pontifical Urban University in Rome from 2003 to 2007.
He returned to Bangladesh in 2007 and was appointed as an assistant priest of Fatima Rani Church.
[6] After 2009 he worked as vice-rector of the Holy Spirit Major Seminary, located in Dhaka.