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Welcome to SIG - Specialists in Gastroenterology

Specialists in Gastroenterology is a well-established G.I. group in Saint Louis, Missouri. This single-specialty medical group provides sensitive, reliable patient care to patients with gastrointestinal illnesses. The group diagnoses and treats challenging clinical G.I. problems and has expertise in diagnostic and therapeutic endoscopy procedures of the gastrointestinal tract. SIG emphasizes the use of innovative new technology coupled with compassionate patient care. Patients can trust the 75 years of combined clinical expertise and their passion for practicing medicine. SIG is actively engaged in clinical research and teaching at Washington University and Barnes-Jewish Hospital.


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From left to right: Erik Thyssen, M.D.,  Caroline Chang, P.A., Leonard Weinstock, M.D., Carrie Meyer, P.A., Aman Singh, M.D., Steven Fern, D.O., Janet Todorczuk, M.D.

From left to right: Erik Thyssen, M.D., Nancy Braddock, P.A., Caroline Chang, P.A., Leonard Weinstock, M.D., Carrie Meyer, P.A., Aman Singh, M.D., Steven Fern, D.O., Janet Todorczuk, M.D.