She joined the OECD as an environmental economist and policy analyst in 1997, and was head of the Division on Climate Change, Biodiversity, and Development from 2006 to 2010.
Her work at OECD has included a leading role in the preparation of the 2001 and 2008 OECD Environmental Outlook reports, as well as analysis of policies in the areas of water pricing, biodiversity incentive measures, market-based instruments, and reform of environmentally harmful subsidies. She developed analysis on the economic crisis and green growth that underpinned a 2009 OECD Declaration on Green Growth, which was adopted by Ministers of Finance and Economy, and is leading the OECD work of fossil fuel subsidies that has been an input to discussions by G20 Leaders.
Prior to joining the OECD, Mountford managed a local recycling company in the U.K. and worked for an environmental NGO in Australia. She is a national of the United Kingdom and the United States, and has master's degrees in environmental economics from University College London and in environmental management from University of Melbourne.