Sextus Empiricus was a Greek philosopher and physician who lived during the late 2nd and early 3rd centuries CE. He is best known for his works on Skepticism, particularly his texts "Outlines of Pyrrhonism" and "Against the Mathematicians." His writings provide a comprehensive account of Pyrrhonian Skepticism, a school of thought that emphasizes the suspension of judgment and the pursuit of tranquility through doubt. As a prominent figure in the Hellenistic philosophical tradition, Sextus Empiricus contributed significantly to the understanding of epistemology and the limits of human knowledge. His ideas influenced later philosophers, including those in the Renaissance and Enlightenment periods, who grappled with questions of certainty and belief.