Guillermo J. Ares, MD

Guillermo Ares is a pediatric surgeon with a special interest in minimally invasive and robotic surgery, adolescent bariatric surgery, pediatric surgical oncology, necrotizing enterocolitis, and chest wall deformities. He also treats newborns with a variety of congenital and acquired conditions including tracheoesophageal fistulas, congenital diaphragmatic hernias, intestinal atresias, chest and abdominal wall defects, hernias, and anorectal malformations.

Dr. Ares co-manages a specialized, multidisciplinary bariatric surgery program for adolescents with obesity and a range of obesity-related comorbidities – the first MBSAQIP accredited adolescent bariatric program in Illinois. The program offers progressive structuring for habit formation leading to healthier lifestyles, incorporating surgical intervention in the toolkit for weight loss and subsequent long-term follow up.

Dr. Ares devoted his academic time to the study of the pathophysiology of necrotizing enterocolitis and the biochemical pathways implicated in this disease of the newborn. He developed a multicellular model for the study of NEC using intestinal pluripotent stem cells.