From its inception in the nineteenth century, photography has instigated a series of theoretical debates. In this new text, Jae Emerling therefore argues that the most insightful way to approach the histories of photography is to address simultaneously the key events of photographic history alongside the theoretical discourse that accompanied them. While the nineteenth century is discussed, the central focus of the text is on modern and contemporary photographic theory. Particular attention is paid to key thinkers, such as Baudelaire, Barthes and Sontag. In addition, the centrality of photography to contemporary art practice is addressed through the theoretical work of Allan Sekula, John Tagg, Rosalind Krauss, and Vilem Flusser. The text also includes readings of many canonical photographers and exhibitions including: Atget, Brassai, August Sander, Walker Evans, The Family of Man, Diane Arbus, Lee Friedlander, Cindy Sherman, Bernd and Hilla Becher, Sebastaio Salgado, Jeff Wall, and others.