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James Slater, U.K. Investor Who Lost, Made Fortune, Dies at 86

James Slater, the British investment banker who amassed a fortune, lost it, then built another, in part by using a stock-picking strategy that he promoted through his book, “The Zulu Principle,” has died. He was 86.

He died suddenly on Nov. 18, according to his website. His death was confirmed by the U.K.’s Telegraph newspaper, where he wrote a column, the last one appearing Nov. 7.