After studying Economics, History and Politics at University College, Durham University, Douglas worked at Midland Bank before becoming, in 1978, a founder member of the asset finance and fund management team established as a subsidiary of the leading international money broker MW Marshall & Co. He became resident director of its Irish business at the age of 29 before returning to the UK to participate in a large number of substantial local authority refinancing projects.
In 1988 Douglas established Owengate, a firm which arranges capital and asset finance for a wide variety of commercial and publicly funded clients. Strengths include raising capital for industrial and urban regeneration, social housing, employment creation and environmental projects. Owengate has previously arranged several large scale financing for UK universities, principally to finance or refinance student accommodation.
Douglas has served on a number of boards including Tullett & Tokyo International Securities Ltd one of the world's largest money brokers and is a Fellow of the Institute of Directors. He has lived virtually all his life in south London, recently moving to the Ashdown Forest in the heart of Sussex.