Question: Sir Walter Leaf was in a field identified by the majority of mainstream scientists as what?

Context articles: Walter Paveley
M. A. Bayfield
Ruggero Santilli
South Wraxall Manor
Ernle baronets
Parapsychology
Sir John Buchanan-Riddell, 11th Baronet
Walter Leaf
Sir Walter Scott, 1st Baronet, of Beauclerc
Baron Northbourne

Sir Walter Paveley KG (1319–1375) was an English knight from Kent, a Knight Founder of the Order of the Garter.
 He was the son of Sir Walter Paveley (d. 1327), a Kentish landholder, and Maud (1304 – c. 1366), daughter and heir of Sir Stephen Burghersh (d. 1310), the elder son of Robert Burghersh (d. 1306).
Matthew Albert Bayfield (17 June 1852 in Kings Norton, Worcestershire – 2 August 1922 in Hertford) was an English classical scholar, author, headmaster, clergyman and spiritualist.
 Bayfield is best known for his commentaries on classical Greek texts as well his writing on the subject of poetry.
 His works include "The Measures Of The Poets" (1919) and "A Study of Shakespeare's Versification" (1920).
 Bayfield collaborated with Walter Leaf and Arthur Woollgar Verrall on numerous commentaries on the works of Sophocles, Homer and Euripides.
Ruggero Maria Santilli (born September 8, 1935) is an Italo-American nuclear physicist.
 Mainstream scientists dismiss his theories as fringe science, which Santilli, in his turn, describes as a mainstream conspiracy against novel science.
South Wraxall Manor is a Grade I listed country house which dates from the early 15th century, located at South Wraxall in the English county of Wiltshire, near Bradford on Avon.
 According to popular legend, South Wraxall was the house where the first tobacco was smoked in England, by Sir Walter Long and his friend Sir Walter Raleigh (although this has also been said of other houses related to Raleigh).
The Ernle Baronetcy, of Etchilhampton in the County of Wiltshire, was a title in the Baronetage of England.
 It was created on 2 February 1660/61 for Walter Ernle, later Member of Parliament for Devizes.
 He died 25 July 1682, and was buried at Bishops Cannings, Wiltshire.
 He was succeeded by his grandson, Sir Walter Ernle (1672–1690), 2nd Baronet, of Maddington, Wiltshire, who was, in turn, succeeded at his own death by his younger brother, Sir Edward Ernle (1673-1728/9), 3rd Baronet, P.C., MP.
 The third Baronet was succeeded by a kinsman, Sir Walter Ernle (1676–1732), 4th Baronet, of Conock, in the parish of Chirton, Wiltshire, who died childless, and was succeeded by his younger brother, the Reverend Sir John Ernle (circa 1680/1-1724), 5th Baronet, Rector of All Cannings, Wiltshire, who was predeceased by his only son.
Parapsychology is a field of study concerned with the investigation of paranormal and psychic phenomena which include telepathy, precognition, clairvoyance, psychokinesis, near-death experiences, reincarnation, apparitional experiences, and other paranormal claims.
 It is identified as pseudoscience by the overwhelming majority of mainstream scientists.
Sir John Walter Buchanan-Riddell, 11th Baronet (14 March 1849 – 31 October 1924) was a British barrister and baronet.
 He was educated at Eton College and Christ Church, Oxford before being called to the bar (becoming a barrister) by Inner Temple in 1874.
 He succeeded his uncle (Sir Walter Riddell, 10th Baronet) as 11th Baronet in the line of Riddell Baronets in 1892.
 In 1897, he served as High Sheriff of Northumberland.
 He was a member of the Council of Keble College, Oxford from 1899 until his death.
 He died on 31 October 1924, succeeded by his son, Sir Walter Robert Buchanan-Riddell, 12th Baronet, who was Principal of Hertford College, Oxford.
Sir Walter Leaf (26 November 1852, Upper Norwood – 8 March 1927, Torquay) was an English banker, classical scholar and psychical researcher.
 He published a benchmark edition of Homer's Iliad and was a director of Westminster Bank for many years, eventually becoming its chairman.
 He was a co-founder and later president of the International Chamber of Commerce, and served as president of the Institute of Bankers, the Hellenic Society and the Classical Association.
 He married Charlotte Symonds, daughter of John Addington Symonds.
 He was a Cambridge Apostle.
Sir Walter Scott, 1st Baronet of Beauclerc (17 August 1826 – 8 April 1910) was an English building contractor and publisher.
 Based in Newcastle upon Tyne, Scott began his profession as a mason, before setting up his own building firm, completing many major architectural projects in the North East of England and notable railway stations in London.
 His publishing house, Walter Scott Publishing Co. brought classic literature to the masses for a low price.
 (He is not to be confused with the novelist and Baronet Sir Walter Scott)
Baron Northbourne, of Betteshanger in the County of Kent, is a title in the Peerage of the United Kingdom.
 It was created in 1884 for Sir Walter James, 2nd Baronet, who had earlier represented Hull in the House of Commons as a Conservative.
 His son, the second Baron, sat as a Liberal Member of Parliament for Gateshead.
 s of 2010 the titles are held by the latter's great-grandson, the fifth Baron, who succeeded his father in 1982.
 Lord Northbourne is one of the ninety elected hereditary peers that were allowed to remain in the House of Lords after the passing of the House of Lords Act 1999, and sits as a cross-bencher.
 The James Baronetcy, of Langley Hall, in the County of Berkshire, was created in the Baronetage of Great Britain in 1791 for the first Baron's grandfather Sir Walter James, the last Warden of the Mint.
 Born Walter James Head, he assumed by Act of Parliament the surname of James only in 1778.
 His son and heir John James notably served as Minister Plenipotentiary to the Netherlands.
 The latter was the father of the second Baronet, who was raised to the peerage in 1884.