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Daniel H. Janzen
Daniel Hunt Janzen (born 1939 in Milwaukee, Wisconsin, U.S.) is an evolutionary ecologist, biologist, conservationist. He divides his time between his professorship in biology at the University of Pennsylvania (Philadelphia, USA), where he has been since 1976, and his research and field work in Costa Rica, where he is an ''ad honorem'' (without remuneration) technical advisor for two long-term and long-range projects, which he conceived and initiated in the early 1970s: Area de Conservación Guanacaste, one of the oldest, largest and most successful habitat restoration project in the world, 1.430 km², located just south of the Costa Rica-Nicaragua border, between the Pacific Ocean and the Cordillera de Tilaran; and the Instituto Nacional de Biodiversidad (INBio), a research organisation that has taken the task of inventorying, cataloguing and describing the country's gigantic natural endowment.
Janzen obtained his B.Sc. degree in Biology from the University of Minnesota, Minneapolis in 1961, and his Ph.D. from the University of California, Berkeley, in 1965. In 1963 he attended as a student a two-month course in tropical biology taught in several field sites throughout Costa Rica. This Advanced Science Seminar in Tropical Biology was the precursor for Fundamentals in Tropical Biology course offered by the Organization for Tropical Studies (OTS), a consortium of several North American and Costa Rican universities. He went back in 1965 as an instructor and has lectured in at least one of the three yearly courses every year since. Before joining the faculty at the University of Pennsylvania he taught at the University of Kansas (1965–1968), the University of Chicago (1969–1972) and at the University of Michigan (1972–1976). Janzen has also held teaching positions in Venezuela (Universidad de Oriente, Cumaná in 1965-66; Universidad de los Los Andes, Mérida in 1973), and in Puerto Rico (Universidad de Puerto Rico, Río Piedras, 1969). Through these teaching positions, continuous association with OTS, and numerous publications, Janzen has been in contact with and influenced the thinking and ideas of many of the researchers and students of tropical ecology and conservation in the western hemisphere during the last 40 years.
Janzen has been influential in the creation of a "model" park, the Area de Conservacion Guanacaste in Costa Rica's northern region of Guanacaste. This park exemplifies Dr. Janzen's beliefs about how a park should be run. It is known for being the site of considerable biological research and for forest restoration and community outreach.
==Research, from theory to praxis and back to theory==
Janzen's work exemplifies the dialectic method of research applied to the biology of the natural world. For him it has not been the passive analysis of documents and data about ecological processes in order to formulate theories, but rather the active creation of life size scenarios of ecological change and their careful and meticulous documentation from which he then formulates theories which inspire new grand experiments in an ever expanding spiral of knowledge based on the keen observation of nature. The following sections are an attempt to synthesise the main themes of his lifelong quest and work.
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