Mark Halle was born in the United States but grew up in Switzerland. His career began in the diplomatic secretariat of the Conference on Security and Cooperation in Europe where he was involved in the negotiation of the Barcelona Convention on the Mediterranean Environment, one of the first regional environmental conventions ever adopted.
He then spent five years with UNEP, where he worked on the global State of the Environment report. Thereafter, he worked with WWF and IUCN in writing the World Conservation Strategy, a document which fundamentally changed the way in which conservation of nature was approached.
In 1984 Halle established IUCN’S Conservation for Development Centre, the organization’s first move to involvement with the developing countries. He was also instrumental in setting up IUCN’s fundraising system, and Global Policy and Partnerships program.
Since his departure from IUCN, he has worked for the International Institute for Sustainable development. Halle lectures, writes and publishes frequently on issues relating to sustainable development and to multilateral trade policy. He is founder and former Chairman of the Board of the International Centre for Trade and Sustainable Development.