Dugald Stewart (; 22 November 175311 June 1828) was a Scottish philosopher and mathematician. Today regarded as one of the most important figures of the later Scottish Enlightenment, he was renowned as a populariser of the work of Francis Hutcheson and of Adam Smith. Trained in mathematics, medicine and philosophy, his lectures at the University of Edinburgh were widely disseminated by his many influential students. In 1783 he was a joint founder of the Royal Society of Edinburgh. In most contemporary documents he is referred to as Prof Dougal Stewart.
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