[1] Mason's first employment was as tutor and chaplain in the family of Samuel Feake, near Hatfield, Hertfordshire.
He moved in July 1746, to succeed John Oakes as minister of a congregation at Carbuckle Street (or Crossbrook), Cheshunt, formed by a union in 1733 of Presbyterians and Independents.
His funeral sermon was preached on 20 February by John Hodge, D.D., Presbyterian minister at Crosby Square, London.
[1] Mason's theological positions were for the most part conservative, and moderately stated.
[1] Mason published, besides separate sermons, 1740–56:[1] Posthumous was The Tears of the Dying annihilated by the Hope of Heaven, a Dialogue.
[1] Mason was said to have received, for his early works and at the suggestion of John Walker, D.D., classical tutor at Independent College, Homerton, the diploma of M.A.
He edited Sermons to Young People, 1747, by John Oakes, his predecessor at Cheshunt.