"Every time I read about a new financial product, I think: 'Uh-oh.' Every new product is described in those same warm, fuzzy phrases: how great they are and how safe. Well, that's how credit default swaps and asset-backed securities were explained when banks were introducing these.

"I still get so angry when I think about it. Taking a job at a rating agency seemed a perfect match: drawing a good salary while providing a service of genuine value for society. We need ratings to work out how safe a company or an investment bond is, what the risk of default might be. If you can't trust it, you shouldn't do business with it – it's that simple.