Henry Fox Talbot (1800–1877) was a pioneer of the photographic process. His innovation was to print photographs, which he called “photogenic drawings,” onto paper using a negative image to print the positive image. His negative-positive process would become the cornerstone of photography all the way until the invention of digital cameras. In his time, he never achieved much financial success, because Louis Daguere’s daguerreotypes were more popular, but Talbot’s contributions to the form were both technical as well as artistic. I supposed I owe my career as a professional portrait photographer in part to Talbot!

Talbot’s famous tree photograph as a negative and positive image.