Haus Labs by Lady Gaga has hired Stephen SantaBarbara as chief operating officer. Bringing years of beauty expertise and a new level of global, operational excellence to the brand,  SantaBarbara will be an integral part of the Haus Labs team, according to the fast-rising company, which recently launched seven new product categories. SantaBarbara will be responsible for forecasting demand, managing and approving costs, sourcing finished product and managing inventory. Working closely with t...