Ansel Adams was an American photographer and environmentalist, best known for his stunning black-and-white landscape photographs of the American West, particularly in national parks like Yosemite. His work helped to promote the conservation of these natural areas and raised awareness about the importance of preserving the environment. Adams was also a pioneer in photographic techniques, developing the Zone System, which allowed photographers to control exposure and development for better image quality. His contributions to photography and environmental advocacy have made him a significant figure in both fields, inspiring generations of photographers and nature lovers.