Daniel Hunt Janzen (born 1939) 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 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.He was awarded the Blue Planet Prize in 2014 for his contributions to solving global environmental problems.