Dr. Mark A. Nelson

Darren Brenner is a Gastroenterologist in Chicago, Illinois. Dr. Brenner has been practicing medicine for over 24 years and is rated as an Elite provider by MediFind in the treatment of Encopresis. His top areas of expertise are Chronic Idiopathic Constipation (CIC), Irritable Bowel Syndrome (IBS), Diarrhea, Gastrectomy, and Colonoscopy.

Dr. Mukund Venu is a Wisconsin native and has lived in the Chicago area for over 10 years. He graduated from Saint Louis University, where he earned both his B.A. in history and medical degree. He completed his internal medicine residency training and gastroenterology and hepatology fellowship training at Medical College of Wisconsin. He also completed a visiting professorship at the Mayo Clinic.Dr. Venu is a board-certified gastroenterologist who specializes in general gastroenterology, colon cancer screening, esophageal disorders, as well as endoscopy and colonoscopy procedures. He is an active member of American Gastroenterological Association, where he serves on the Nominating Committee, as well as the American College of Gastroenterology where he serves on the Training Committee. Dr. Venu is rated as a Distinguished provider by MediFind in the treatment of Encopresis. His top areas of expertise are Swallowing Difficulty, Encopresis, Bowel Incontinence, Endoscopy, and Colonoscopy.

Susannah Spiess is a Gastroenterologist in Glenview, Illinois. Dr. Spiess is rated as an Advanced provider by MediFind in the treatment of Encopresis. Her top areas of expertise are Familial Adenomatous Polyposis, Gastroesophageal Reflux Disease (GERD), Turcot Syndrome, Colonoscopy, and Gastrectomy.