“... When Asian markets crumbled in 1997, Mr. Tepper added Korean stocks to a portfolio laden with Russian debt. The moves led to hundreds of millions of dollars in profits when markets rebounded two years later. He scored big on junk bonds in 2003, and his 2007 wager on steel, coal and other resource companies paid off in 2008 when commodity prices soared.But because he sometimes places more than half of his portfolio in a single trade idea, Mr. Tepper also is prone to brutal, abrupt losses.”