He’s been the best overall skier in the world for three separate seasons. He’s won the Tour de Ski, the grueling multi-day event that swings through central Europe each January, on three occasions. He won Switzerland’s first ever Olympic gold in cross-country in the 15 k freestyle in Vancouver, helping to bring an unprecedented amount of attention to the sport in his home country. At the age of 26 Dario Cologna has already amassed numerous...