Glidden was born with
spina bifida, a neural tube defect that damages the spinal cord and nerves. He received his first wheelchair at the age of four. Glidden was introduced to sports at the age of 13 at Katahdin Junior High School in
Stacyville, Maine. He has participated in sports like wheelchair racing, skiing, and competitive shooting. In October 2015, Glidden climbed
Yosemite National Park's
Washington Column by using a metal bar attached to a mechanical ascender. The following October, he scaled Yosemite's
El Capitan after doing more than 800 pull-ups a day to train for the climb. Glidden was carried in a rescue basket and the descent took 12 hours. It was featured in the short documentary
Enock. Glidden rock climbs and ice climbs with Paradox Sports, which offers adaptive climbing across the United States. He also works with Maine Trail Finder to assess the accessibility of trails around the state. Glidden's blog, "Go Beyond the Fence", recounts his adventures and encourages people of all abilities to experience the outdoors. == Personal life ==