Eliot Porter made his first color photograph in 1939, the year he resigned from teaching and research to pursue photography as a career. Over the next fifty years, his work was exhibited widely and he produced more than two dozen books of his photographs. He became a passionate ambassador for environmental causes and, through his images, set the standard for color landscape photography and inspired generations of photographers to come. Robert Glenn Ketchum counts himself among them. Ketchum is among the leading contemporary photographers of the American landscape. His many books use fine art color photography to address environmental issues.