Current job: Chairman of the executive committee of the board of directors of Citigroup

Link to Enron: Mr Rubin, the Treasury Secretary under former President Bill Clinton, is said to have called his old department on behalf of Enron as its financial problems became a crisis.

The Treasury Department says Mr Rubin contacted the Under Secretary for Domestic Finance, Peter Fisher, on 8 November – a month before Enron’s collapse.

Citigroup is one of Enron’s main creditors, and Mr Rubin is reported to have asked Mr Fisher about the possibility of pressing bond-rating agencies not to downgrade their estimate of Enron bonds to avoid a crisis of confidence in the energy group.