Ivor Lloyd Tuckett (1 February 1873 – 28 November 1942) was a British professor of physiology, physician, and skeptic.

He studied natural science and physiology at Trinity College, Cambridge between 1890 and 1894, where he was awarded the degrees of BA (1893-4), MA (1897), and MD (1910).

The book exposed the tricks of fraudulent mediums and is a criticism of the claims of psychical research.

[4] It was also positively reviewed in The Lancet which concluded "It is decidedly a book to be read by all who are interested in human psychology; and every practitioner of medicine ought to place himself in this category.

He described it as "thorough in execution, so broad in treatment, so acceptable in form and content, is a cause for congratulation in the rationalistic camp.