JPMorgan's Staley Joins BlueMountain By: CNBC.com News January 08, 2013 at 08:12 AM EST Former JPMorgan investment-banking chief James "Jes" Staley is joining BlueMountain Capital, the $12 billion hedge fund, as a managing partner. Read More >> Related Stocks: Bank of America Goldman Sachs Group JPMorgan Chase & Co Morgan Stanley