Barrie Gilbert's fascination with grizzly bears almost got him killed in Yellowstone National Park. He recovered, returned to fieldwork and devoted the next several decades to understanding and protecting these often-maligned giants. He has spent thousands of hours among wild grizzles in Yosemite and Yellowstone national parks, Alberta, coastal British Columbia, and along Brooks River in Alaska's Katmai National Park, where hundreds of people gather to watch dozens of grizzlies feast on salmon. His research has centered on how bears respond to people and each other, with a focus on how to keep humans and bears safe.