Nouriel Roubini told the BBC that he is concerned about the growing gap between the "bubbly and frothy" stock markets and the real economy.
Over the last six months, the Dow Jones Industrial Average has risen about 45%.
But Mr Roubini says he sees an economy where consumers are "shopped out" and "debt burdened".
Based on the run up in share prices in recent months, investors appear to be betting that good times are around the corner. A view not shared by Mr Roubini. "The crisis is not yet over," the New York University professor said.