Meet the Team

The Bariatric Center at Columbia St. Mary’s offers comprehensive care before, during, and after surgery. The team is led by a surgeon who is fellowship-trained in bariatric surgery and laparoscopic surgery.

Other team members provide a variety of support and care services. Specialists in nutrition, psychiatry, gastroenterology, sleep medicine, rehabilitation, and endocrinology will work together to help you in your recovery. And our specially trained nursing staff understands your special needs while you receive care in the Bariatric Center.


Joseph Regan, MD, Medical Director

Dr. Regan earned his degree in medicine from Northwestern University in Chicago in 1996. He completed his residency in general surgery at the University of Maryland Medical System in Baltimore in 2002. In 2003, Dr. Regan completed a fellowship in laparoscopic digestive surgery at Mount Sinai Medical Center in New York City. Dr. Regan has been board certified in surgery and bariatric surgery since 2003.

Joseph Regan, MD
Joseph Regan, MD
Medical Director

Craig Siverhus, MD

Dr. Siverhus earned his degree in medicine from the Medical College of Wisconsin in 1988. He completed his residency in general surgery at the Medical College of Wisconsin Affiliated Hospitals in 1993. In 1994, Dr. Siverhus completed a fellowship in vascular surgery at St. Louis University in Missouri.
Dr. Siverhus has been board certified in surgery since 1995.


Dr. Craig Siverhus
Craig Siverhus, MD

Susan Dugan, CBN, Nurse Coordinator

Susan earned her degree in nursing from Columbia University in New York City in 1977. She has extensive experience coordinating and providing care for bariatric patients, and is a certified bariatric nurse. As a patient advocate in the Bariatric Center, Susan provides support for patients in all aspects of their care. She coordinates pre- and postoperative care, and follow-up care well after surgery.


Susan Dugan, CBN
Nurse Coordinator

Other Team Members

Many other Columbia St. Mary’s staff members are members of the Bariatric Center team. Nurses in the Bariatric Center’s inpatient unit, the nursing surgical coordinator, the laparoscopic coordinator, physical therapists, psychologists, psychiatrists, anesthesiologists, dietitians, surgical technicians, and others have received special training in meeting the special needs of bariatric patients.



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