Meet Our Gastroenterologists

MacNeal Gastroenterologists are physicians with training in management of diseases of the organs of the digestive tract, including the liver, esophagus, stomach, small intestine, colon and rectum, pancreas, and gallbladder bile ducts. Gastroenterologists are trained in the diagnosis and treatment of many diseases, including colorectal cancers.

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Manuel Alva, MD

Manuel Alva, M.D.
GI specialist, board-certified in Gastroenterology and Internal Medicine.
Allen Bernthal, MD

Allen Bernthal, M.D.
GI and liver specialist, board-certified in Gastroenterology and Internal Medicine.
Joseph Bresnahan, MD

Joseph Bresnahan, M.D.
GI specialist, board-certified in Gastroenterology and Internal Medicine with advanced therapeutic endoscopic training.
Jennie Ng, MD

Jennie Ng, M.D.
GI specialist, board-certified in Gastroenterology and Internal Medicine with advanced therapeutic endoscopic training.
Allen Rosenbaum, MD

Allen Rosenbaum, M.D.
GI specialist, board-certified in Gastroenterology and Internal Medicine.
Amit Srivastava, M.D.
Amit Srivastava, M.D.
Gi specialist, board-certified in Gastroenterology and Internal Medicine with advanced therapeutic endoscopic training. His special interests include heartburn, ulcer, pancreatic diseases, colon, liver and bile duct problems.

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Many of the physicians featured on this website are independent members in good standing with the medical staff at MacNeal Hospital and are neither employees nor agents of the hospital. As such, MacNeal Hospital is not responsible for any actions that these physicians may take in their medical practices. These physicians are independent physicians who are members of the MacNeal Hospital medical staff, and are not employees, agents or partners of MacNeal Hospital, and have not entered into joint ventures with the hospital.