Berkshire Hathaway losing bet against dollar

It is interesting to see Warren Buffet’s Berkshire Hathaway having such a terrible year considering it’s usually a top performer year in and year out.  Part of the reason has been the affects from Hurricane Katrina against their insurance holdings.  Another reason has been Buffet’s bet against the dollar.  Recently:

"The company also reduced its stake in foreign currency contracts to $16.5 billion on Sept. 30 from $21.5 billion three months earlier. Buffett has bet against the dollar since 2002 amid concern that high U.S. trade and budget deficits might cause non-U.S. investors to pull money from the country."

I know Buffet is known as one of the greatest investors of all time but has the foreign exchange market ever been his specialty.  I don’t know the answer to this nor do I know who is the greatest foreign exchange investor of all time.  I’d like to find out though. 

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