On February 5, 2019, the Board of Directors of the Proteostasis Therapeutics, Inc. elected Marija (Masha) Zecevic, PhD., current Chief Operating Officer, as the Company's Chief Commercial Officer and Sheila Wilson, current Senior Vice President, Clinical Development Operations, as the Company's Chief Operating Officer, effective immediately. Ms. Wilson has been serving as Chief Operating Officer since February 2019. Prior to Proteostasis Therapeutics, Ms. Wilson served as Vice President, Global Clinical Operations at Synta Pharmaceuticals.