Ralph Clevenger teaches courses in Stock Photography, Video Production, Natural History Photography, and Undersea Photography. He has traveled throughout the world leading workshops and photographing assignments for such clients as MacGillivray-Freeman Films, Fox Sports, Lifelong Learning Inc., The National Park Service, Monterey Bay Aquarium, and the Nature Conservancy. Ralph's freelance work can be seen in many national and international publications including; Nature's Best, Islands, Men's Health, Outside, National Geographic Traveler, National Geographic Kids, Scuba Diving, Sierra Club Books, National Geographic Books, Smithsonian Books, and others. His photographs are represented worldwide by CORBIS Images.