PITTSBURGH --(BUSINESS WIRE)--Jan. 4, 2021-- Krystal Biotech Inc. , (“Krystal”) (NASDAQ: KRYS), the leader in redosable gene therapies for rare diseases today announced the appointment of Chris Mason , MD, PhD, FRCS, FMedSci, and Jing L. Marantz , MD, PhD, MBA to its board of directors.