Amazon.com description: Product Description: The author, Stewart Aitchison has lived in Flagstaff for more than 40 years, originally coming to northern Arizona to attend Northern Arizona University. He worked for about 10 years as a field biologist for the Museum of Northern Arizona before serendipitously becoming a naturalist for Lindblad Expeditions, which has recently partnered with National Geographic. Stewart Aitchison's research and travels have resulted in numerous books and articles, and his photography has been published widely. Stewart Aitchison is a zoologist and geologist by training and a naturalist by passion. He has been exploring, photographing, teaching, and writing about the Colorado Plateau for more than forty years, ten of those as a field biologist for the Museum of Northern Arizona. Besides leading trips for Grand Canyon Field Institute, he also escorts educational excursions for National Audubon Society, Smithsonian, Lindblad Expeditions, National Geographic Expeditions, Elderhostel, and other educational groups across the globe. Some of his latest publications include: Grand Canyon's North Rim and Beyond, Grand Canyon: Window of Time, A Traveler's Guide to Monument Valley, A Guide to Southern Utah's Hole-in-the-Rock Trail, and The Desert Islands of the Sea of Cortés.