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Mr. Walther serves as Chief Commercial Officer of Prometheus Biosciences. Prior to joining Prometheus Biosciences, Mr. Walther was General Manager at Aries Pharmaceuticals, establishing corporate, pipeline, and portfolio strategies including the commercial launch of the company’s first two products. Mr. Walther’s industry experience spans numerous therapeutic markets, most notably a greater than 25-year focus in pharmaceutical, medical device and diagnostics product development and commercialization in gastroenterology. Prior to joining Aries, Mr. Walther was Vice President, Marketing and Commercial Development at Prometheus Laboratories Inc. where he was responsible for commercializing specialty therapeutics and proprietary diagnostic testing services designed to advance patient-personalized care and previously held roles spanning sales, specialty marketing, and commercial operations at Takeda Pharmaceuticals North America and TAP Pharmaceuticals (a Takeda Pharmaceuticals & Abbott Laboratories Partnership). Mr. Walther received his B.A. in Biology from Ithaca College.