Having obtained a university exhibition in 1766, he proceeded to Pembroke Hall, Cambridge, where he took the degree of B.A.

Soon after his ordination he was appointed assistant-chaplain to Martyn Madan at the Lock Hospital, where he quickly became known as a popular and eloquent preacher.

In 1789 he was appointed by Mr. Alderman Pickett as his chaplain during his mayoralty, and in 1794 was instituted vicar of Godstone, Surrey.

He died in Stamford Street, Blackfriars Road, on 16 September 1820, in the seventy-fifth year of his age, and was buried in Godstone churchyard on the 25th of the same month.

Aided by a fine presence and great fluency of speech, De Coetlogon acquired a considerable reputation as a preacher of the Calvinistic school.