Guillaume-Benjamin-Amand Duchenne (de Boulogne) (September 17, 1806 in Boulogne-sur-Mer – September 15, 1875 in Paris) was a French neurologist who revived Galvani's research and greatly advanced the science of electrophysiology. The era of modern neurology developed from Duchenne's understanding of neural pathways and his diagnostic innovations including deep tissue biopsy, nerve conduction tests (NCS), and clinical photography. This extraordinary range of activities (mostly in the Salpêtrière) was achieved against the background of a troubled personal life and a generally indifferent medical and scientific establishment.