Formerly, he was the chairman of the London Stock Exchange Group (LSE), Europe's largest cash equities platform following its 2007 acquisition of Borsa Italiana. He took over the position in May 2003, two years after the LSE floated on its own market. He oversaw the group’s three largest purchases – Borsa Italiana in 2007, a majority stake in LCH.Clearnet in 2013, and the planned $2.7bn deal to buy Frank Russell Investments. He also helped to defend the exchange against repeated takeover attempts, starting with the move by Deutsche Boerse in late 2004 and repeated efforts by the Nasdaq.
Gibson-Smith spent most of his early career in the energy business, joining British Petroleum - as the former state-owned company was then called - from university. He rose to become chief geologist and then group managing director of the privatized group - renamed BP - from 1997-2001.
He left BP in 2001 to become chairman of National Air Traffic Services, the privatized UK aviation administrator, a post he held until 2005, and was director of Lloyds TSB, the UK bank, from 1999 to 2005. He was a governor of the London Business School from 2005-2012, and a director of the Qatar Financial Centre Regulatory Authority from 2006–2012. He was chairman of The British Land Company PLC, the UK’s second largest property group by market cap, from January 2007 – December 2012. 
Gibson-Smith has a BSc in Geology from Durham University (1967), a PhD in Geochemistry from Newcastle University (1970) and a Masters in Business from Stanford University (1985). He was a Sloan Fellow of the Stanford Business School (1984-85), and is an Honorary Fellow of University College, Durham.
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