The 'author' appears to have been a well known judge; https://en.wikisource.org/wiki/Pigott,_Gillery_(DNB00)

Sir Gillery Pigott’s use, in his signature, of his initial (‘G’) rather than his unusual first name (Gillery) has been liable to cause some confusion. As a baron of the exchequer his title was not hereditary, but there was another contemporary Pigott, whose title was hereditary, namely Sir George Pigott, 1st Baronet, of Knapton (1766-1844). That title is currently held by the sixth baronet, Sir David who was born in 1955.
I mention this by way of clarification because the situation is further complicated by the Pigot (with only one ‘t’) baronetcy (created in 1764) whose earlier members distinguished themselves in the armed services. Herr Michael Schneider recently discovered (using https://www.britishnewspaperarchive.co.uk/) an advertisement placed in a Welsh newspaper (January 1896) by ‘Lady Pigot, Hillside, Bracknell, Berks,’ who purposed 'visiting Wales yearly.’ She was therefore seeking the services of ‘an intelligent North Welsh maid’ who was required to be from ‘amongst Open Brethren’ and to have ‘a strong clear voice for helping in Gospel work.’ The advertiser was the widow of the fourth baronet Sir Robert Pigot who died in 1891.
Their son Sir George Pigot (1850-1934) was the fifth baronet and, with his wife Alice Louisa Raynsford (a daughter of Sir James Thompson Mackenzie), took an active part in the work of the Bridge Hall assembly in Reading which is now Argyle Community Church (see Philip Chandler’s account at
http://argylecommunitychurch.org.uk/pages/our-history). Sir George Pigot was also one of the original founders of the UK Evangelization Trust. I understand there was an article on his work, a few years ago in Stewardship’s magazine ‘Share’ by Ruth Leigh. Timothy Stunt.

I confess myself rather bewildered by the different Pigotts and Pigots, and their interaction with Brethren. The following I found interesting: -- [SIR GEORGE PIGOTT, Baronet, of KNAPTON, Queen's County: created a Baronet. Married February 15 1794 Annabella daughter of the Right Hon Thomas Kelley[sic] of Kellyville Queen's County late one of the judges of the court of Common Pleas in Ireland and has issue born October 12 1796 and other children.]
This entry which I have excerpted from “THE PRESENT BARONETAGE OF THE UNITED KINGDOM” 1821, shows that the children of Sir George Pigott (First Baronet) were cousins of Ireland’s premier hymnwriter Rev. Thomas Kelly.

Just reposting the missing bit of your comment as my system still doesn't handle html chars in comments properly!

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SIR GEORGE PIGOTT, Baronet, of KNAPTON, Queen's County: created a Baronet. Married February 15 1794 Annabella daughter of the Right Hon Thomas Kelley[sic] of Kellyville Queen's County late one of the judges of the court of Common Pleas in Ireland and has issue born October 12 1796 and other children

His entry on Wikipedia says "Pigott died at his home, Sherfield Hill House, near Basingstoke, Hampshire on 27 April 1875 from a heart attack precipitated by a fall from his horse. He was buried at the parish church at Sherfield upon Lodden the next day. His son, Arthur Gough Pigott, banned the Anglican burial service being read over the coffin, leading to a £1 fine with costs." evidentally sourced from the Oxford Dictionary of National Biography.

A niece of his, Lucy Ann Dolly Pigott, married William John Close. He is mentioned in Noel's 'History of the Brethren' as Capt W J Close as being amongst the 'Lowe' brethren. A brother of his, Farnham Chidley Close, married Amelia Wellesley a sister of Miss Charlotte Wellesley the hymnwriter. He (FC Close) was one of JND's executors.