Scientist Scott Schliebe retired from the U.S. Fish and Wildlife Service in Anchorage, Alaska, in 2008 after studying polar bears for more than 20 years. He was the former chair of the IUCN's Polar Bear Specialist Group. His most recent work has focused on the Chukchi population of polar bears, which is shared by the U.S. and Russia. He was also involved with determining whether the polar bear should be listed as a threatened species under the Endangered Species Act.