Count Olympe-Clemente-Alexandre-Auguste Aguado de las Marismas was a Franco-Spanish photographer and socialite, active primarily in the 1850s and 1860s. One of several early photographers who learned the practice from Gustave Le Gray, Aguado pioneered a number of photographic processes, including carte de visite photographs and photographic enlargement processes. He was also a founding member of the influential French Photographic Society in 1854.

Jean-Baptiste Gustave Le Gray was a French painter, draughtsman, sculptor, print-maker, and photographer. He has been called "the most important French photographer of the nineteenth century" because of his technical innovations, his instruction of other noted photographers, and "the extraordinary imagination he brought to picture making." He was an important contributor to the development of the wax paper negative.