John Duffield

John Duffield (born 1939) is a British financier. He founded Jupiter Fund Management, one of the largest fund managers operating in London.

Born the son of a physician and educated at Harrow School, Duffield went into investment management and, having become manager of his wife's estates, moved to Switzerland as a tax exile.

He founded Jupiter Asset Management in 1985. After selling Jupiter Asset Management to Commerzbank, he founded New Star Asset Management in 2001.

He was married to Vivien Clore but was divorced from her in 1976; they had one son and one daughter.

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