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Wilfred Batten Lewis Trotter, FRS[1] (1872–1939) was a British surgeon, a pioneer in neurosurgery. He was also known for his studies on social psychology, most notably for his concept of the herd instinct, which he first outlined in two published papers in 1908, and later in his famous popular work Instincts of the Herd in Peace and War. Trotter argued that gregariousness was an instinct, and studied beehives, flocks of sheep and wolf packs.


Born in Coleford, Gloucestershire in 1872, Trotter moved to London to attend college at age 16. An excellent medical student, he decided to specialise in surgery and was appointed Surgical Registrar at University College Hospital in 1901 and Assistant Surgeon in 1906. He opened his own practice after obtaining his medical degree. He was also a keen writer, with an interest in science and philosophy. In 1908, he published two papers on the subject of herd mentality, which were precursors to his later, more famous, work.

Working at University College Hospital in London as professor of surgery, he held the office of honorary surgeon to King George V from 1928 to 1932. He was also a member of the Council of the Royal Society that conferred their Honorary Membership on Professor Freud, whom he attended after his move to England. Later he was consulted about Freud's terminal cancer, in 1938. He was elected a Fellow of the Royal Society in May 1931.[2] In the last years of his life, he became professor and director of the surgical unit at UCH and turned to writing on a larger scale.

He died in Blackmoor, Hampshire in 1939. The Collected Papers of Wilfred Trotter, an anthology of his final essays, appeared two years after his death.

Trotter was also the surgeon, at University College London for whom Wilfred Bion worked as a resident in his own medical training, before he famously studied groups and trained as a psychoanalyst at the Tavistock Institute. In her account of Bion's life "The Days of our Years,"[3] his wife Francesca writes of the great influence Trotter had on the direction of Bion's work on group relations.

Edward Bernays, author of Propaganda and nephew to Freud, also refers to Trotter and Gustave Le Bon in his writings.

He met Sigmund Freud several times. According to Ernest Jones[4] (Freud's first biographer), "he was one of the first two or three in England to appreciate the significance of Freud's work, which I came to know through him. He was one of the rapidly diminishing group who attended the first International Congress at Salzburg in 1908".

Major works[]

Trotter's popular book, The Instincts of the Herd in Peace and War is an analysis of group psychology and the ability of large numbers of people to be swayed by innate tendency. In it he popularised in English the concept, first developed by French sociologist Gustave Le Bon, of an instinct overriding the will of the individual in favour of the group.

Trotter's writings about the herd mentality, which began as early as 1905 and were published as a paper in two parts in 1908 and 1909 are considered by some to represent a breakthrough in the understanding of group behaviour, long before its study became important in a variety of fields, from workplace relations to marketing.


Trotter, W. (1908). “Herd instinct and its bearing on the psychology of civilized man - part 1.” Sociological Review, July.
Trotter, W. (1909). “Herd instinct and its bearing on the psychology of civilized man - part 2.” Sociological Review, January.
Trotter, W. (1919). Instincts of the Herd in Peace and War - 4th impression, with postscript. New York, MacMillan.

Cooke, D. (1987). “Book review - WILFRED TROTTER, Instincts of the herd in peace and war 1916-1919, London, Keynes Press, 1985.” Medical History 31(1): 113-4.[5]
Holdstock, D. (1985). Introduction. in: Instincts of the herd in peace and war 1916-1919. W. Trotter. London, Keynes Press: pp xxviii.


  1. Cite error: Invalid <ref> tag; no text was provided for refs named frs
  2. Lists of Royal Society Fellows 1660-2007. The Royal Society. URL accessed on 18 July 2010.
  3. BPAS - The Days of our Years: Francesca Bion 1994 at
  4. PEP Web - Wilfred Trotter at
  5. DOI:10.1037/h0066945
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See also[]

External links[]

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