The first person to spot Carstensz Pyramid (or Puncak Jaya) is reported to be the Dutch navigator and explorer Jan Carstensz in 1623, for whom the mountain is named. Carstensz was the first (non-native) to sight the glaciers on the peak of the mountain on a rare clear day. The sighting went unverified for over two centuries, and Carstensz was ridiculed in Europe when he said he had seen snow and glaciers near the equator. The snowfield of Puncak Jaya was reached as early as 1909 by a Dutch explorer, Hendrik Albert Lorentz with six of his indigenous Dayak Kenyah porters recruited from the Apo Kayan in Borneo. The now highest Carstensz Pyramid summit was not climbed until 1962, by an expedition led by the Austrian mountaineer Heinrich Harrer with three other expedition members - the New Zealand mountaineer Philip Temple, the Australian rock climber Russell Kippax, and the Dutch patrol officer Albertus (Bert) Huizenga.