Rodan + Fields founders and dermatologists Katie Rodan, MD and Kathy Fields, MD have created a global community of skin-care aficionados, and now they’re expanding into a new category: hair care. Development for the new collection began in 2020, which is also when the brand enlisted the help of celebrity hairstylist Bridget Brager—her clients include Kristen Bell, Priyanka Chopra, Gwyneth Paltrow and more—with everything from key ingredients and packaging to marketing concepts and R+F Consultant education. Here, our exclusive interview with Drs. Rodan and Fields about the brand’s exciting new launch. What inspired your launch into hair care? Dr. Katie Rodan: “As practicing dermatologists, product developers and entrepreneurs, we saw…