Roald Engelbregt Gravning Amundsen was a Norwegian explorer of polar regions. He led the first Antarctic expedition to the South Pole between 1910 and 1912. He was also the first person to reach both the North and South Poles. He is known as the first to traverse the Northwest Passage. He disappeared in June 1928 while taking part in a rescue mission. With Douglas Mawson, Robert Falcon Scott, and Ernest Shackleton, Amundsen was a key expedition leader during the Heroic Age of Antarctic Exploration.