Joachim Gans
Sir Richard Grenville, leader of Raleigh's expedition, founded the Roanoke Colony on Roanoke Island off the coast of modern North Carolina in 1585. Among the ruins at the Roanoke site, archaeologists have discovered lumps of smelted copper and a goldsmith’s crucible attributed to Gans's work at the colony. Because the royal mining company failed to resupply colonists who were also becoming increasingly fearful of conflicts with the Native Americans, they accepted an offer from Sir Francis Drake in June 1586 to sail them to England. Each of the colonists, including Gans, left North America.
Thor Heyerdahl
In "Easter Island: The Mystery Solved" (Random House, 1989), Heyerdahl offered a more detailed theory of the island's history. Based on native testimony and archaeological research, he claimed the island was originally colonized by Hanau eepe ("Long Ears"), from South America, and that Polynesian Hanau momoko ("Short Ears") arrived only in the mid-16th century; they may have come independently or perhaps were imported as workers. According to Heyerdahl, something happened between Admiral Roggeveen's discovery of the island in 1722 and James Cook's visit in 1774; while Roggeveen encountered white, Indian, and Polynesian people living in relative harmony and prosperity, Cook encountered a much smaller population consisting mainly of Polynesians and living in privation.