Seosamh Céitinn was born and raised in Cork City. He attended University College Cork, where he earned both a BA and an MA in Modern Irish before completing a Higher Diploma in Education. He spent over thirty years teaching Irish in Athlone before retiring in 2022. He published his first book, Tomás Oileánach, in 1992, about the well- known Irish-language writer Tomás Ó Criomhthain.