Widely acknowledged as the principal architect of Scottish common sense philosophy, Thomas Reid is increasingly recognized today as one of the finest philosophers of the eighteenth century. Combining a sophisticated response to the skeptical and idealist views of his day, Reid's thought stands as an important alternative to Humean skepticism, Kantian idealism and Cartesian rationalism. This volume is the first comprehensive overview of Reid's output and covers not only his philosophy in detail, but also his scientific work and his extensive historical influence.