City Chemist, a boutique pharmacy in the bustling heart of downtown Brooklyn on Montague Street, has a beauty department that comprises more than half the store and serves as an enclave for well-heeled residents. And with a product mix including Estee Lauder, Fresh, Laura Mercier, Smashbox, Caudalie, Clarins, Butter London, Mario Badescu, Stila, Philosophy, Anthony Logistics, the Art of Shaving and OPI, it’s hard to find a reason to go anywhere else. Diana Dolling-Ross, founder and owner of City Chemist, as well as Town & Country Apothecary in Ridgewood, N.J., sat down with Beauty Insider to discuss her recipe for success.