We never see them on our TV and movie screens anymore, so how on Earth did Mary-Kate and Ashley Olsen build up an estimated net worth of $400 million in just three decades? Turns out, they’re savvy businesswomen, and they have been for over 10 years.

Sure, we all know the twins from Full House and their plethora of straight-to-VHS movie roles, but the 31-year-olds are also producers, authors, and fashion designers. Now that they’re basically retired from acting, the duo has been focusing their attention on behind-the-scenes jobs.

In fact, their most acclaimed work to date seems to stem from their careers in fashion: They won the Council of Fashion Designers of America award for Womenswear Designer of the Year in 2012 and 2015, and snagged the council’s Accessories Designer of the Year prize in 2014. “The Olsen twins are two of the richest women in entertainment even though they have not had major roles for more than 20 years,” Celebrity Net Worth observes.

Of course, it took the Olsens longer than a New York Minute to build their empire. Scroll down to see their various business ventures (or should we say, check out Mary-Kate and Ashley in Action below?)