Until 1880, Aspen, Colorado was known as Ute City, after the Native American people who inhabited the valley. During the silver boom of the 1880s it was an extremely prosperous small town. There are still traces of that era, including the Wheeler Opera House. It came to an abrupt halt in 1893 when the silver market collapsed. The place was moribund for fifty years until the Chicago industrialist Walter Paepcke, who liked to ski, saw the potential of the place as a resort. Among other things he created the Aspen Institute where industrialists like himself might be exposed to Aristotle. The Aspen Center for Physics, where I have been coming since the 1960s, was originally part of the institute. This used to be a pretty funky town. In 1970 Hunter S. Thompson ran for sheriff. There were some wealthy people like Paepcke but they pretty much faded into the background. Either you could ski or you couldn’t. Things have changed. There are now fifty billionaires who have some sort of property in Aspen. Three of the Koch brothers – Charles, David and William – have roots here. (William is the poor Koch brother, worth only $2.3 billion.) Donald Trump does not own any property here – though he once tried to build a hotel – but he has left a trail.