Sir James Clark Ross, Sir Robert Falcon Scott, and Rear Admiral Richard Evelyn Byrd were all Antarctic explorers. Sir James Clark Ross was a British naval officer and explorer who led two expeditions to the Antarctic in 1839 and 1843. Sir Robert Falcon Scott was a British Royal Navy officer and explorer who led two expeditions to the Antarctic in 1901 and 1910. Rear Admiral Richard Evelyn Byrd was an American naval officer and explorer who led four expeditions to the Antarctic between 1928 and 1956. All three of these explorers made significant contributions to the exploration of the Antarctic.