20 profiles of people who built something worth studying — what they actually did, what you can take from it, and where it went wrong. Nobody here gets a clean write-up, because the failures are usually where the lesson is.

Opened one shop to feed her children, and built a retail chain by refusing to do what cosmetics retail did.
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Spent years and thousands of prototypes on a product nobody in the industry wanted to sell.
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Built the world's biggest furniture retailer by designing the price first and the product afterwards.
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Made an airline profitable for decades by refusing to add things customers were not paying for.
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Started with a few thousand dollars of savings, no outside investment, and no experience of the industry.
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Understood his costs in more detail than anyone else in the industry, and used it to price competitors out.
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Gave the product away in small quantities until people came back to buy it.
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Sold mobile phones to people the networks were ignoring, by explaining rather than selling.
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Was thrown out of the company he founded, spent twelve years elsewhere, came back and made it the most valuable in…
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Did not invent the car, the assembly line or mass production — but put them together and changed what a factory was.
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Built the world's largest retailer by opening in the towns everyone else thought were too small.
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Turned a brand into the product, then licensed it into industries he knew nothing about.
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Arrived in Britain as a child refugee, founded a software firm in 1959 with £6, and signed her letters 'Steve' so…
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Worked out that he was earning more than the entire staff combined, decided that was indefensible, and signed the…
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Ran the hi-fi shop with the highest sales per square foot in the world, then gave the business to his staff.
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Started with a market stall and a demob gratuity, and built it on 'pile it high, sell it cheap'.
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Built a luxury house by taking things away — and licensed a perfume in a deal that shaped the rest of her life.
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Made a fortune by buying understandable businesses at sensible prices and then doing almost nothing for decades.
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Started by importing Japanese running shoes out of his car, and spent years one bad month from insolvency.
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A penny bazaar in Leeds market with a sign that solved a language problem and invented fixed pricing.
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