In 2014, Gina Mercurio was looking to hire a teacher of restorative yoga — a slow-paced, therapeutic practice for people who have injuries or who simply need to wind down — when a colleague recommended Christine Loeber. Loeber showed up at Mercurio’s Petaluma, Calif., yoga studio for an interview, and after they sat and talked for two hours, Mercurio hired her on the spot.