A French scholar and teacher, the son of Emile Masson, who served under Napoleon and having survived the retreat from Moscow lived in exile in London where he met and married Masson's English mother.
While engaged in producing a vast and, for its time, innovative body of scholarship for specialists and valuable study aids for students and pupils, Masson was also a frequent contributor to The Athenaeum and the regular reviewer of French literature for the Saturday Review from 1872 to 1880.
He gave up his Harrow mastership in 1888 and died a few weeks later on 29 August at Woodlands, Tooting Common, Streatham, Surrey, while on a visit to his good friend Sir Henry Doulton. Masson was buried in Harrow churchyard
(Thomas Seccombe and Gregory Maertz. Oxford DNB)