André-Adolphe-Eugène DISDÉRI (1819-1889) was a French photographer and daguerreotypist.  He achieved fame and fortune introducing and popularising the carte de visite format for portrait photographs.  Disdéri’s cartes de visite were 6 x 9 cm, smaller and cheaper than cabinet cards, and about the size of conventional (non-photographic) visiting cards of the period.  Cartes de visite ‘calling cards’ were enormously popular and the craze brought about the decline of the daguerrotype.  Disdéri also invented the twin-lens reflex camera.