Peary was the expedition leader for Donald MacMillan's first experiences in the Arctic in 1908-1909. He was also the explorer who first claimed to see Crocker Land in the Polar Sea.
Robert Peary was the expedition leader for both Donald MacMillan's and George Borup's first experiences in the Arctic, having taken both of them on his third polar expedition, in 1908-1909. He was also the explorer who first claimed to see Crocker Land in the Polar Sea.