The billionaires’ net worths, which Forbes now tracks daily, are listed as estimated by Forbes on June 9, 2014, and in May 2014 by the Los Angeles Business Journal. Property values listed are from the county assessor’s most recent valuation period, which reflects the market as of June 30, 2012, and formed the basis for property tax bills for 20. Using those lists as a starting point, Aspen Journalism, an investigative journalism nonprofit that produced this story for Aspen Sojourner, then used public property records-and old-fashioned shoe-leather reporting-to verify the billionaires’ stakes in the Aspen community. And we’ve included the Crown family, owners of the Aspen Skiing Company and multiple local homes, who recently made Forbes’s inaugural list of America’s Richest Families. Two are listed as billionaires by the Los Angeles Business Journal, but not by Forbes. All but three are on the 2014 Forbes World’s Billionaires list. Here, then, are the Aspen 50: the fifty wealthiest people in the world with property in Pitkin County-and there are almost certainly more than those who appear on our list.