Son of Ferdinando Warner and born in London in 1736, he was admitted to St Paul's School on 30 March 1747.
[2][3]Trinity College, Cambridge, For many years Warner was popular as a preacher at a chapel, his private property, in Long Acre, London.
[2] In 1778 Warner was living as a gentleman of leisure, with rooms in Barnard's Inn, and had formed a connection with George Augustus Selwyn.
[8] Barlow visited Hayley at Eartham with Warner in 1792, encountering also James Stanier Clarke.
Becoming involved in French politics, he was once proposed for citizenship, with six others;[11][12] but was detained in 1793 as he tried to leave the country, living for a time outside Boulogne before being allowed to depart in 1794.
[2] Warner was the author of Metronariston; or a New Pleasure recommended, in a Dissertation upon a part of Greek and Latin Prosody (anon.