Dr. Thyssen joined Specialists in Gastroenterology in 1993 after finishing fellowship training at Washington University in St. Louis and Internal Medicine residency training at Michael Reese Hospital in Chicago. He is a graduate of the Medical School of Copenhagen in Denmark. Dr. Thyssen is Board Certified in Gastroenterology and Internal Medicine. He is active in teaching and has an appointment as an Assistant Professor of Clinical Medicine and Surgery with the Washington University School of Medicine. He is a gastroenterologist on staff at Barnes-Jewish, Barnes-Jewish West County and Missouri Baptist Hospitals in St. Louis, Missouri. Dr. Thyssen provides individualized care for adult patients with a wide variety of ailments affecting the digestive system.

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