Book excerpt: Photography Visionaries is an inspiring guide to 75 of the most influential photographers from c.1900 to the present. Entertainingly written by an expert on photography, it provides a fascinating insight into the lives and careers of men and women working in a medium which perhaps more than any other in the visual arts has been deeply affected by technological change. The entries are arranged chronologically, instilling in the reader an understanding of what marks each photographer as a visionary. Each entry is less about providing a full biography of the person and more about creating a sense of excitement regarding their work and the lasting impact that it has had on photography. With the aid of an arresting selection of photographs, some well-known and others less so, this book offers a unique and engaging perspective on the development of photography through some of its most inventive practitioners.