Forest Service Bob Marshall (1901–1939) – cofounder of The Wilderness Society, which helped pass the Wilderness Act, which created the first legal definition of wilderness and conserved some of national forest land in the United States Walter Bitterlich (1908–2008) – world-renowned Austrian scientist, best known for the invention of variable plot sampling Jack C. Westoby (1913–1988) – Chief Forester, United Nations Food and Agriculture Organization, "father of world forestry" Sakari Pinomäki (1933–2011) – pioneer of mechanized forest harvesting vehicles, decreasing the time required for harvesting and risk to loggers Stephen C. Sillett (1968–) – revolutionized the approach and methodology of studying plant and animal life in old growth canopies of large trees Allied fields Botany – study of plant life and development that explains the biological basis of trees, such as structure, growth, reproduction, metabolism, response to disease, and chemical properties Conservation biology – conscientious management of forests can preserve or enhance biodiversity of dependent species Dendrochronology – method of scientific dating based on the analyses of tree-ring growth patterns, analysis of long-lived individual trees can provide insight into climatic conditions of the past Ecology – whose principles are the main scientific basis of forestry Ecophysiology – study of an organism's physiology to environmental conditions that explains the success of a particular tree species' growth, reproduction, survival, and abundance Forest history – documents natural and human history of forests and forest use Natural resource management – brings together planning, management, conservation and sustainability of human use of natural resources, including forests Rural sociology – studies human perceptions, interactions and use of forests and associated resources Soil science – physical, chemical, and biological properties of soil greatly determines the success of tree species and individuals See also Outline of ecology References External links State of the World's Forests (SOFO) – a report issued by the Food and Agriculture Organization of the United Nations on forest and forestry trends worldwide, last published in 2009 Forestry Images International Society for Tropical Foresters The Forestry Commission The Forestry Guild Sylva Foundation International Wood Collectors Society Xiloteca Manuel Soler (One of the largest private collection of wood samples) Rainforest Alliance UNU Open Educational Resource on Forestry, Forest Economics and Forest Policy Forestry Forestry