Paleontologist Osborn, as pictured on a 1928 cover of Time

Henry Fairfield Osborn (August 8, 1857–November 6, 1935) was an American paleontologist and geologist. August 8 is the 220th day of the year in the Gregorian Calendar (221st in leap years), with 145 days remaining. ... 1857 was a common year starting on Thursday (see link for calendar). ... November 6 is the 310th day of the year (311th in leap years) in the Gregorian Calendar, with 55 days remaining. ... 1935 was a common year starting on Tuesday (link will take you to calendar). ... A paleontologist carefully chips rock from a column of dinosaur vertebrae. ... A geologist is a contributor to the science of geology. ...

Osborn was born in Fairfield, Connecticut, and studied at Princeton University. He was professor of comparative anatomy from 1883 to 1890 at Princeton. In 1891 he became professor of biology at Columbia University, becoming professor of zoology in 1896. He was president of the American Museum of Natural History from 1908 to 1935, during which time he accumulated one of the finest fossil collections in the world. Fairfield is a town located in Fairfield County, Connecticut, about five miles southwest of Bridgeport on the Gold Coast of Connecticut. ... Princeton University, located in Princeton, New Jersey, is the fourth-oldest institution of higher education in the United States. ... Comparative anatomy is the study of similarities and differences in organisms. ... Main article: Life There are many universal units and common processes that are fundamental to the known forms of life. ... Columbia University is a private university in New York City. ... Zoology (Greek zoon = animal and logos = word) is the biological discipline which involves the study of animals. ... The American Museum of Natural History is a landmark of Manhattans Upper West Side in New York, at 79th Street and Central Park West. ... A fossil Ammonite Fossils are the mineralized remains of animals or plants or other traces such as footprints. ...

He was mentored by the paleontologist Edward Drinker Cope. He led many fossil-hunting expeditions into the American Southwest, starting with his first to Colorado and Wyoming in 1877. He described and named Tyrannosaurus rex in 1905, the Pentaceratops in 1923, and the Velociraptor in 1924. Some of his contributions are less celebrated: Osborn's belief in the now-discredited idea of orthogenesis is one such contribution, his promotion of eugenics, another. Edward Drinker Cope Edward Drinker Cope (July 28, 1840–April 12, 1897) was an American paleontologist and comparative anatomist. ... The Southwest region of the United States is drier than the adjoining Midwest in weather; the population is less dense and, with strong Spanish-American and Native American components, more ethnically varied than neighboring areas. ... This is the article on the state. ... State nickname: Equality State Other U.S. States Capital Cheyenne Largest city Cheyenne Governor Dave Freudenthal Official languages English Area 253,554 km² (10th)  - Land 251,706 km²  - Water 1,851 km² (0. ... Binomial name Tyrannosaurus rex Osborn, 1905 Tyrannosaurus rex (tyrant lizard king) was a giant carnivorous theropod dinosaur from the Upper Maastrichtian, the last stage of the Cretaceous period, 65 – 66 million years ago. ... Species Pentaceratops ( five-horned face) is a ceratopsid herbivorous dinosaur genus from the Latest Cretaceous period of North America. ... Binomial name Velociraptor mongoliensis Osborn, 1924 A model of a velociraptor Velociraptor mongoliensis (fast thief), was a coyote-sized, agile and slender theropod dinosaur species from the Upper Cretaceous (Campanian) with an up-curved skull and large sickle-shaped claws. ... Orthogenesis, orthogenetic evolution or autogenesis, is the hypothesis that life has an innate tendency to move, in a unilinear fashion, to ever greater perfection. ... Eugenics is the self-direction of human evolution: Logo from the Second International Congress of Eugenics, 1921, depicting it as a tree which unites a variety of different fields. ...

Osborn wrote an influential textbook, The Age of Mammals (1910).