This is pretty amazing.

So, one afternoon in October of 1999, Danielson took a chance and told Chase about her car-sharing idea. Chase was enthusiastic, but she wanted to make sure her husband would be okay with her taking on such a big project. That night she went home, talked to him, and decided to go ahead. Within a few days Chase and Danielson had their first official Zipcar business meeting.

Today, Zipcar — which is still headquartered in Boston — has offices in more than 26 American cities and 860,000 members across the US, Austria, Canada, Spain, and the UK. And the company’s profile only grew when car-rental giant Avis bought Zipcar for $491 million in January 2013. But in fact, both founders left the company more than 10 years ago, as power struggles and disputes prevented both Chase and Danielson from seeing their shared vision through. Now 56, Danielson hasn’t spoken to Chase in more than a decade.

Imagine sitting back and watching your brainchild explode in popularity – without you.