Jackson Hole in Wyoming has long been associated with the more extreme end of skiing. Here's someone who has been part of creating that tradition, still jumping into couloirs.
Wild Bill Davidson has been part of the self-styled Jackson Hole Air Force (we're sure you can work out why the name!) for 37 years, jumping into couloirs and dropping off cliffs to get to the best snow.
Here he is on his 63rd birthday keeping the fire alive