Paratek Pharmaceuticals, Inc. has expanded its senior leadership team with the appointment of Regina Paglia as senior vice president, Human Resources, and Stephen Villano, M.D. as vice president, Clinical and Medical Affairs.   Ms. Paglia will be based in Paratek’s Boston headquarters. Dr. Villano will be based out of the company’s Philadelphia office. Paratek is a biopharmaceutical company focused on the development and commercialization of therapies based on tetracycline chemistr...