Ann O'Connor, MD

Director, Adolescent Bariatric Surgery Program, Ann & Robert H. Lurie Children's Hospital of Chicago at Northwestern Medicine Central DuPage Hospital Pediatric Outpatient Center ; Assistant Professor of Surgery, Northwestern University Feinberg School of Medicine


Special Interests

Bariatric surgery in teens, general pediatric surgery, minimally invasive surgery, pediatric tumors, chest wall and abdominal wall defects, congenital anomalies, pediatric critical care

Biographical Information

Medical School

Rush Medical College of Rush University Medical Center, 1994

Postgraduate Training

Residency in pediatric surgery, Nationwide Children's Hospital, Columbus, OH, 2001-2003; Residency in general surgery, Medical College of Wisconsin Affiliated Hospitals, 1994-2001

Additional Information

​Dr. O’Connor is a leading authority in the surgical care and treatment of obesity and obesity-related disorders in teens. 

Dr. O’Connor leads the only bariatric surgery program in the State of Illinois with multidisciplinary expertise specifically dedicated to the treatment of adolescents and their unique medical, behavioral, nutritional and psychological needs. When behavioral, lifestyle and non-surgical medical interventions fail, bariatric surgery can resolve up to 80 percent of obesity-induced medical conditions. Dr. O’Connor’s interest in surgical weight management in teens was sparked by her observations early in her career that many of her patients had medical and surgical problems stemming from obesity.

In addition to bariatric surgery, Dr. O’Connor has surgical expertise in the treatment of a variety of congenital and acquired diseases in the newborn, child and adolescent, including pediatric trauma and injury, congenital malformations, pediatric tumors and others.

Dr. O’Connor’s research focuses on the surgical management and outcomes of adolescents who undergo weight-loss surgery.

Procedures performed

  • Sleeve gastrectomy for weight loss
  • Roux-en-Y gastric bypass for weight loss
  • Thorascopic Nuss procedure for pectus excavatum
  • Abdominal and alimentary tract surgeries
  • Bowel surgery
  • Mesenteric cyst and mesenteric tumor resection
  • Breast surgery
  • Pancreatic surgery
  • Retroperitoneal tumor resection
  • Endocrine surgeries, including surgeries of the adrenal gland
  • Congenital neck cyst excision and drainage
  • Gynecologic surgeries, including ovary surgery and removal (oophorectomy), hysterectomy and pelvic cyst and tumor removal
  • Spleen surgery, splenectomy
  • Lymph node biopsy and excision
  • Rectal surgery
  • Diaphragmatic surgery
  • Thoracotomy
  • Vascular malformation removal
  • Muscle biopsies