The Leopold Report is a 1963 paper composed of a series of ecosystem management recommendations that were presented by the Special Advisory Board on Wildlife Management to United States Secretary of the Interior Stewart Udall. Named for its chairman and principal author, zoologist and conservationist A. Starker Leopold, the report proved influential for future preservation mandates and reports. After several years of public controversy regarding the forced reduction of the elk population in Yellowstone National Park, Udall appointed an advisory board to collect scientific data to inform future wildlife management of the national parks. The committee observed that culling programs at other national parks had been ineffective, and recommended management of Yellowstone's elk population. In addressing the goals, policies, and methods of managing wildlife in the parks, the report suggested that in addition to protection, wildlife populations should be managed and regulated to prevent habitat degradation. Touching upon predator control, fire ecology, and other issues, the report suggested that the National Park Service hire scientists to manage the parks using current scientific research. The Leopold Report became the first concrete plan to manage park visitors and ecosystems under unified principles. It was reprinted in several national publications, and many of its recommendations were incorporated into the official policies of the NPS. Although the report is notable for proposing that park management have a fundamental goal of reflecting "the primitive scene... a reasonable illusion of primitive America", some have criticized it for its idealism and limited scope.