Shark Tank is known for turning scrappy ideas into multimillion-dollar household brands, such as Scrub Daddy , Bombas , and BeatBox .

But one of the show’s biggest misses came when a startup called Doorbot walked onto the set. The video doorbell walke d away without an investment, but a few years later, under a new name—Ring—it became a billion-dollar success story found on the doorsteps across the country.

But according to its founder, Jamie Siminoff , the company’s rise wasn’t the product of luck or a single breakthrough—it was built on relentless work.

“‘Work-life balance’ was a phrase and a goal, not a reality,” wrote Siminoff in his new book out today: Ding Dong: How Ring Went from Shark Tank Reject to Everyone’s Front Door .

Speaking with Fortune ahead of the

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