John Llewellyn is Partner at Independent Economics. He has ten years in academia at University of Cambridge, 17 years in international public service at OECD and 14 years in the corporate sector at Lehman Brothers. Llewellyn is a founding partner of Independent Economics, which specialises in macroeconomics, climate change, political economy and financial economics. He is a member of the Advisory Panel, Office for Budget Responsibility, a Trustee at National Institute of Economic and Social Research. He is an expert witness in numerous law cases. Llewellyn received his undergraduate degree at Wellington, New Zealand, and his Doctorate at Oxford. In 1970 he was appointed Research Officer in the Department of Applied Economics at Cambridge. From 1972 he was a Fellow of St. John’s College, Cambridge, and in 1974 was appointed Assistant Director of Research in the Faculty of Economics at Cambridge. He then spent 17 years at the OECD in Paris, where he led international economic forecasting and policy analysis; then Deputy Director for Social Affairs, Manpower and Education, and finally Head of the Secretary-General’s Private Office. From 1995 to 2008 he was Lehman Brothers Global Chief Economist, and then Senior Economic Policy Advisor. For three years from 2008 he was an advisor to H. M. Treasury. Llewellyn has published widely since September 2026.