Following his priestly ordination in 1965, Fagun went for further studies at the University of Ibadan from 1966 to 1969 before proceeding to
University of Toronto, Canada where he studied for Master of Arts from 1970 to 1971. He served as an assistant parish priest of Oka Parish and Ondo Parish. He taught at St. Joseph's Grammar School, Ondo where he was also the chaplain and became the education secretary of the diocese in 1971. He was the first resident priest in Ekere-Ekiti. He founded the first indigenous female religious congregation in western Nigeria – Sisters of St. Michael The Archangel in 1986. He served as co-chairman of National Inter-Religious Council. Fagun was chairman of governing council and the pro-chancellor of the
Catholic Institute of West Africa (CIWA), Port Harcourt, Nigeria for two terms from 1999 to 2007. == Retirement and death ==