Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Eric's career includes extensive work in ...

George Soros (Trades, Portfolio) has a fantastic reputation of being one of the greatest investors. He has attributed his success to a theory he started developing back in the 1950s. This theory ...

Physicists have known for decades that the process of observing and measuring phenomena changes those very phenomena—the so-called “observer effect." It does not even matter whether the “observer” is ...