In the 1937 bestseller, Hill shares what he learned from studying 500 millionaires, including Andrew Carnegie and Charles Schwab. The book outlines ways to re-imagine how you think about time, money and relationships.

In an interview at CNBC’s iConic conference in New York, Daymond John, the successful entrepreneur behind fashion brand FUBU and investor on ABC’s “Shark Tank,” said he learned one of his top productivity tricks from Hill.

“I do goal-setting,” John tells CNBC. “The first time I read about this was in Napoleon Hill’s ‘Think and Grow Rich,’ I was 16 years old.”

At any given time, he explains, he has a list of 10 goals, each of which have deadlines.

“Six of them expire in five months,” John explains, “one expires in fives years, one expires in 10 years and one expires in 20 years.”

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