I Asked Mark Cuban Why He's Leaving 'Shark Tank.

How Van Leeuwen Ice Cream's Laura O'Neill and Other Growth-Minded Entrepreneurs Keep Their North Star

I was curious. Cuban is arguably Shark Tank 's most popular star, and he's invested in hundreds of companies over the years. Why stop now?

"[ Shark Tank ] shoots in the summer and I want to spend that time with family before my kids are off on their own," Cuban told me.

On the surface, Cuban's reason for leaving Shark Tank is simple and heartwarming. Look closer, though, and it teaches a powerful lesson in emotional intelligence, the ability to understand and manage emotions to reach your goals.

For entrepreneurs and business owners, the temptation is always to do more: Work longer hours. Make more money. Grow, grow, grow the business.

Cuban knows the value of hard work. But he's also always preached the superior value of another asset: Time.

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