In fall 2009, Art Burrows, Penn Newhard and Chris Davenport began compiling lines for their new book, Fifty Classic Ski Descents of North America. Now, over a decade later, the book has inspired another wave of ski mountaineers, namely Noah Howell, Cody Townsend and (most recently) Michael Wirth, who have each embarked on a quest to ski the 50 lines—including some so daunting that, Burrows says, “skiing just one during a lifetime would be enough for most people.”