Running a studio is an enormous undertaking that requires you to wear many hats at once (and with expertise): pedagogy, customer service, business management and beyond. Some owners find they're better off doing the work with a trusted partner by their side—someone to share both the responsibilities and the rewards. But finding the right person to work with isn't easy. You need someone whose personality, strengths and weaknesses complement your own. Here, three sets of successful partners get to the heart of how they make it work.