Development economist specializing in sustainable development. Formerly: Director, New York Office, UNEP, and Special Representative of UNEP Executive Director, responsible for environment policy coordination and collaboration with other UN Agencies and outreach to civil society and private sector; lead role in supporting ministerial-level intergovernmental process to review international environmental governance and UNEP's participation in World Summit on Sustainable Development; Executive Director, Secretariat of Secretary-General's High Level Panel on UN System Wide Coherence. With CEB, oversees secretariat supporting it in UN system wide policy coordination under chairmanship of the UN Secretary-General and comprising executive heads of UN system organizations. 2000-06, Trustee and Member of the Board, World Conservation Monitoring Centre, Cambridge, UK, a biodiversity information institution.