John P Calamos: the richest investor you’ve never heard of

John P Calamos - the son of impoverished Greek immigrants - is today one of the world's richest men. So where does the veteran investor see the markets heading this year?

John P Calamos is heading our way. The billionaire US investor, who manages assets of around $32bn, is setting up shop in London, where he is opening new offices for his firm, Calamos Investments.

While he may not be a household name yet in the UK, Calamos is worth watching. The author of two books on investing, he ranked 258th on the Forbes Rich List in 2006. Not bad for the son of a Greek immigrant who, according to Forbes, swept floors at his parents' grocery store in Chicago.

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Piper Terrett is a financial journalist and author. Piper graduated from Newnham College, Cambridge, in 1997 and worked for Germaine Greer and for Adam Faith’s Money Channel before embarking on a career in business journalism. 

She has worked for most top financial titles, including Investors Chronicle, Shares magazine, Yahoo! Finance and MSN Money. She lectures part-time at London Metropolitan University and is the author of four books.