His responsibilities included transcription of records and cataloguing of Pepys's library;[3] during his employment, he also published a number of Protestant polemical and devotional tracts.
In the 1690s, Lorrain's Protestant theological leanings, perhaps together with concern for his future arising out of Pepys advancing years, led him to the Church of England.
In a joint letter from Alexander Pope and Bolingbroke to Swift, dated December 1725, the 'late ordinary' is described ironically as the 'great historiographer.'
[2] A number of questions were raised by Daniel Defoe as to the extent to which his polemical and commercial interests affected the authenticity of his Confessions.
[2] Besides several sermons, including one on Popery near akin to Paganism and Atheism, dedicated to Harley (1712), and a translation of Pierre Muret's Rites of Funeral (1683), Lorrain brought out in 1702 a little book, entitled The Dying Man's Assistant, dedicated to Sir Thomas Abney, Lord Mayor, in addition to which he published and advertised on the vacant spaces of his Confessions various small manuals of medicine, devotion, corn-cutting, &c. – probably his own compilations.