John Whitehead studied medicine at Leiden, gaining an MD in 1780. He was licensed by the College of Physicians in 1782. He wrote several books on medicine and some tracts on disputes with Methodists; also a biography of John Wesley. He published two books of philosophy: An Essay on Liberty and Necessity (1775), using the pseudonym of Philaretius; and Materialism Philosophically Examined: Or, The Immateriality of the Soul (1778). In this second book, Whitehead attacks the claim that thought might be a property of matter, using the standard arguments.
From The Continuum Encyclopedia of British Philosophy in Oxford Reference.