educators, and fellow scientists, including naturalists Thomas Say and Charles-Alexandre Lesueur, to New Harmony from Philadelphia aboard the keelboat Philanthropist (also known as the "Boatload of Knowledge"). Thomas Say (1787–1834), a friend of Maclure, was an entomologist and conchologist. His definitive studies of shells and insects, numerous contributions to scientific journals, and scientific expeditions to Florida, Georgia, the Rocky Mountains, Mexico, and elsewhere made him an internationally known naturalist. Say has been called the father of American descriptive entomology and American conchology. Prior to his arrival at New Harmony, he served as librarian for the Academy of Natural Sciences in Philadelphia, curator at the American Philosophical Society, and professor of natural history at the University of Pennsylvania. Say died in New Harmony in 1834. Charles-Alexandre Lesueur (1778–1846), a naturalist and artist, came to New Harmony aboard the Philanthropist. His sketches of New Harmony provide a visual record of the town during the Owenite period. As a naturalist, Lesueur is known for his classification of Great Lakes fishes. He returned to his native France in 1837. Many species were first described by both Say and Leseuer, and many have been named in their honor. David Dale Owen (1807–1860), third son of Robert Owen, finished his formal education as a medical doctor in 1837. However, after returning to New Harmony, David Dale Owen was influenced by the work of Maclure and Gerard Troost, a Dutch geologist, mineralogist, zoologist, and chemist who arrived in New Harmony in 1825 and later became the state geologist of Tennessee from 1831 to 1850. Owen went on to become a noted geologist. Headquartered at New Harmony, Owen conducted the first official geological survey of Indiana (1837–39). After his appointment as U.S. Geologist in 1839, Owen led federal surveys from 1839 to 1840 and from 1847 to 1851 of the Midwestern United States, which included Iowa, Missouri, Wisconsin, Minnesota, and part of northern Illinois. In 1846 Owen sampled a number of possible building stones for the Smithsonian Institution Building (the Smithsonian "Castle") and recommended the distinctive Seneca Creek sandstone of which that building is constructed. The following year, Owen identified a quarry at Bull Run, twenty-three miles from nation's capital, that provided the stone for the massive building. Owen became the first state geologist of three states: Kentucky (1854–1857), Arkansas (1857–1859), and Indiana (1837–1839 and 1859–1860). Owen's museum and laboratory in New Harmony was known as the largest