The Philosopher, the Priest, and the Painter

In the Louvre museum hangs a portrait that is considered the iconic image of Rene Descartes, the great seventeenth-century French philosopher. And the painter of the work? The Dutch master Frans Hals--or so it was long believed, until the work was downgraded to a copy of an original. But where is the authentic version, and who painted it? Is the ma