The Mammut Sports Group has appointed Kris Kustler, formerly Swiss managing director of the company, as managing director of Mammut North America, with immediate effect. The appointment follows the sudden departure of Joe Prebich after only about six months in the post. Mammut said the separation was made “professionally,” but offered no explanations for the move. Prior to his stint at Mammut, where he helped the Swiss company to take over Mountain Hub, Prebich worked for Fjallräven, Zeal Optics and Oakley.