Print this Page Gastroenterology Services & Programs Orbera Intra-Gastric Balloon Pediatric Gastroenterology Watch Colonoscopy Prep Video Locations & Contact Meet the Physicians Imtiaz Alam, M.D.UMC GastroenterologyView Profile Hamed Al-Tamimi, M.D.UMC GastroenterologyView Profile Vanessa Costilla, M.D.UMC GastroenterologyView Profile Kanak Das, M.D.UMC GastroenterologyView Profile Robert Simek, M.D.UMC Children’s GastroenterologyView Profile