Many of the tutors of the School will also always be remembered with affection by old boys for their immense contribution to the progress and fame of the School. These will include Mr. (later Professor) C O. Taiwo who joined the School in 1939 as Senior Science master and (later master of the Boarding House). It was from the School that he won a government scholarship in 1944 to study Mathematics at Trinity College, Cambridge. In his recent book "Seventy years in the Nigerian Education System", he says he had happy reminiscences of the School of whose remarkable achievements he is immensely proud. Professor C. O. Taiwo was honoured by the OGS in December 2004, with the award of Honorary Member of the Old Grammarians' Society.
Others were Revd S. R. S. Nicholas, who came from Adisadel College, Cape Coast, Ghana and who succeeded Mr. Taiwo as Master of the Boarding House. Mr. A. O. Ogedengbe; D. O. Fagunwa (the Yoruba Author); A. O. Odebiyi; Revd (later Bishop) Festus Segun; M. A. Odesanya (later Justice); Pa Tuke Johnson (tutor in Music and Organist for decades at St. Paul's Church, Breadfruit); Pa J.,A. Adeniji (People's Warden at The Cathedral) who taught two generations of Grammarians; Pa Ogunba, the great Geometry Tutor and Pa Adeyemi, who did not spare the rod on unruly boys.
There were also the likes of Mr. G. U. Ekefre; Mrs. C. M. Akinluyi (who later became the Principal of Holy Child's College) and Chief A. A. Osunneye (Principal of Methodist Boys High School, Lagos) both of whom were Vice Principals at the CMS Grammar School at different times; Newton Oladeinde (Music Teacher, aka Baba Mose); J. Wigwe (Geography); S. Olu. Fadeyi; Mr. A. K. Idebi; Mrs. S. A. Adebisi; Mrs. Elizabeth Oyedepo; S. A. Oduguwa; S. O. Sobande; Tokunbo Adegboyega (later Mrs. Adesanya); the famous Indian couple Mr Jacob and Miss George who taught Biology; etc., etc.