Rifat Atun is director of strategy, performance and evaluation at the Global Fund.

VOA: special.2010.03.10

By delaying entries or exits, or more likely this year exiting prematurely, they negatively affect the performance of the strategy for themselves.

FORBES: Sell In May Could Still Come Into Play But Don't Bail Now

In April he published an article reporting the 10-year performance of several methods of harnessing annual seasonality as an investing strategy from 2002 to 2012.

FORBES: Late-July Is Rarely Pleasant For Stocks

At the end of his book, he relegates stock picking to a secondary or tertiary facet of investment strategy, worth perhaps 10% of your performance, with 70% assigned to the decision among stocks, bonds and cash, and 20% to the choice of subsectors of stocks.

FORBES: Magazine Article