In the mid-1970s, I wandered into the Grand Canyon and never came out! I worked as a backcountry ranger, finished my geology degree at Northern Arizona University, became a river guide on the Colorado and San Juan rivers, then received an advanced degree in geology and began working as a geologic interpreter around the globe. I am now a geologic educator, an award-winning author, and lecturer on outdoor adventures and worldwide expeditions. My geology-themed river trips and hikes in the Grand Canyon and the Southwest are very popular. My books are written so that professionals find them useful, while remaining accessible to lay audiences. Write to me (below) for more information.