 Others in the party were the chief guide and co-leader Harry Peter Karstens; Robert Tatum, an Episcopal missionary, who served as cook; and two Gwich'in teenagers, Johnny Fredson and Esaias George, who helped prepare and maintain the base camp.This pair also brought the dog teams down when the terrain became too rough for their use.On March 17, 1913, the expedition left from Nenana to climb Denali.