Scholars such as Thomas McEvilley, Christopher I. Beckwith, and Adrian Kuzminski have identified cross influences between ancient Buddhism and the ancient Greek philosophy of Pyrrhonism. The Greek philosopher Pyrrho spent 18 months in India as part of Alexander the Great's court on Alexander's conquest of western India, where ancient biographers say his contact with the gymnosophists caused him to create his philosophy. Because of the high degree of similarity between Nāgārjuna's philosophy and Pyrrhonism, particularly the surviving works of Sextus Empiricus Thomas McEvilley suspects that Nāgārjuna was influenced by Greek Pyrrhonist texts imported into India.