Onabolu, who had taught informally to enthusiastic students began teaching in a few top schools in Lagos such as King's College, Lagos and CMS Grammar School, Lagos.
He was the grandson of bishop Samuel Ajayi Crowther and the son of the founder of the first secondary school in Nigeria, the CMS Grammar School, Lagos.
Thomas Decker attended the CMS Grammar School in Lagos until the death of his father in 1920, when his mother decided to move the family back to Sierra Leone and where he attended the CMS Grammar School in Freetown.
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