In 1972, he was appointed full professor of biology at
Essen University. In 1975, he was recruited as president of the then newly-founded
University of Kassel. In 1981, he joined the
United Nations in New York as director at the UN Center for Science and Technology. From 1984 to 1991 he headed the Institute for European Environmental Policy in Bonn. In 1991, Weizsäcker became founding president of the
Wuppertal Institute, soon establishing itself as a leading environmental think tank. In 1998, he was elected a member of the German
Bundestag for the
Social Democratic Party (SPD) and was re-elected in 2002. As a legislator, he chaired the select committee on
globalization (2000–2002) and the environment committee (2002–2005). After his decision not to run in the 2005 election, he became Dean of the
Bren School of Environmental Science & Management at the
University of California, Santa Barbara. He returned to Germany in 2009 where is his an honorary professor at
Freiburg University. A bestselling author in Germany, his English language books include
Earth Politics (1994),
Factor Four: Doubling Wealth, Halving Resource Use (1995),
Factor 5 (2009) and
Limits to Privatization (2005). ==Other activities==