In most parks and related conservation lands, outdoor recreation is encouraged in order to provide human enjoyment and benefits. However, recreation use always compromises nature conservation goals to some degree, with the magnitude of recreation impact on park environments increasing greatly in recent decades along with increasing population, leisure time, and mobility. Today, we are all too familiar with the ecological impacts of recreation. They range from multiple trails scarring meadows and deeply eroded trails, to large barren campsites compacted to the point where it is a challenge to pound in a tent stake (Figure 1), to bears stealing food, to human waste and toilet paper in piles on the ground. Since at least the 1960s, concerned voices have been asking if we are loving our parks to death.Management of visitors and the impacts they cause has long been among the primary responsibilities PSF NEW PERSPECTIVES of park managers. For much of this time, visitor management has not been informed much by science. Management has had little to rely on other than tradition and common sense. Recently, however, this has changed. The contributions of recreation ecology-the study of the ecological effects of recreation-have become foundational to the scientific management of parks and other conservation lands. Less well known than such parkrelevant scientific fields as wildlife biology and fire ecology, recreation ecology is arguably as important to park management.In this paper I describe the early history of the field and introduce some of its most important contributors. I cover the development of recreation ecology from its infancy to its early maturity as a scientific discipline-the 1920s to about 2000. By that time, several individuals had pursued careers in