sentences:  From the 1880s to the early 1900s, his scientific research allowed him to travel to Europe, Russia, Alaska, Japan, and the Pacific coast of the United States.He became professor of zoology in 1904.In 1909, Dean published "Studies on fossil fishes (sharks, chimaeroids and arthrodires)", published in "Memoirs of the American Museum of Natural History"  and other articles on the Arthroleptid frog "Astylosternus robustus" and on the egg capsules of "Chimaera".