Boasting some of the biggest vertical relief in North America and some of the best skiing anywhere in the world, California’s Eastern Sierra Nevada hits its zenith in spring with warm weather for camping at the foot of massive snow-covered peaks. For the last 25 years, Nate Greenberg has been documenting all the best lines to ski, and his book, Backcountry Skiing California’s Eastern Sierra (along with co-author Dan Mingori), is the “bible” of the region. In addition to co-authoring the book, Nate was also a GIS expert in his former life working for Mono for two decades, now the Chief Administrative Officer for Inyo County. He’s also the co-founder of the Eastern Sierra Avalanche Center. We chat with Nate about a variety of topics related to the Eastern Sierra and what makes it so special, as well as the controversial launch of the OnX Backcountry app featuring ski lines from the book, which some fear will blow up all the secret spots. Nate also opens up about a harrowing avalanche incident in the Bardini Chutes that nearly took his life. Purchase the book at your local outdoor retailer or online at Wolverinepublishing.com and donate to ESAC at esavalanche.org.