He was educated at Sherborne and Trinity College, Oxford, awarded a BA in 1676 and becoming a Doctor of Divinity in 1713 .
[1] Barker was Rector of Rotherfield Greys, Oxfordshire, before being made a prebendary Canon of Westminster in 1716.
He is buried in the south transept of Westminster Abbey where his memorial is inscribed, 'Dr Harry Barker, prebendary of this Collegiate Church, died on he 5th day of September in the year of Our Lord 1740 aged 87'.
Barker lived in one of the houses abutting on the north side of the nave of Westminster Abbey.
He never married and left his estate to his servant, widow Lake Chapman, and her family.