Marie Kondo is a self-proclaimed organization nerd. As a child, she obsessively read books about tidying up. At the age of 19, she launched her own consulting firm, and in 2010 she published The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing. Her KonMari method instructs disciples to clean quickly and purge their homes of anything that does not bring them joy. But what makes her method truly effective is its emphasis on inner tidiness. “I propose that in order to tidy your house, you must tidy up your mind,” she says. Now Kondo has brought the KonMari method stateside and over 2 million copies of her book have been sold worldwide. The biggest difference between her Japanese and American clients? “Children in the U.S. have more toys, and that that makes it harder for my American clients to tidy up.” This discovery has her dreaming of teaching students how to tidy up in schools and traveling the world to study the art of organization in more countries. In the meantime, she’s busy launching her own training program for Kondos-in-the-making who want to become professional organization nerds, too.