Meet the Bariatric Surgery Team

As a nationally recognized Bariatric Surgery Center of Excellence®, Sansum Clinic is here to help you make—and maintain—profound changes for lasting weight loss. From extensive pre-operative education, through ongoing follow-up support, count on personalized care every step of the way.

Get to know a little about our dedicated team here. Read bariatric patient testimonials. Then call (805) 898-3472 or RSVP for a free weight-loss surgery orientation, where we’ll walk through the different types of procedures we perform, and see if you may be a candidate.

Marc Zerey, MD, CM, MSc, FRCSC, FACS – Bariatric Surgeon

Dr. Marc Zerey, bariatric surgeonDr. Marc Zerey is a board-certified physician at Sansum Clinic specializing in bariatric surgery and advanced laparoscopic techniques. He performs minimally invasive primary and revisional weight loss surgery, including Roux-en-Y gastric bypass, sleeve gastrectomy and adjustable gastric banding. These procedures require just a few small incisions and often offer less pain and scarring, fewer complications and faster recovery.

In addition to bariatric surgery, Dr. Zerey performs minimally invasive procedures to treat hernias, heartburn, bowel conditions, disorders of the spleen and tumors of the stomach and adrenal gland, as well as complications of the gallbladder and bile ducts.

Dr. Zerey has published extensively, including journal articles in American Surgeon, American Journal of Surgery, Journal of Surgical Research, and Surgical Innovation. He is a frequent lecturer on surgical topics including weight loss surgery.

Christina Archer, MS, RD – Bariatric Dietitian

Christina Archer, MS, RD - Clinical Dietitian

Unlike many bariatric programs, Sansum Clinic provides individualized nutritional counseling and medical therapy before and following surgery. As a registered bariatric dietitian with a master’s degree in nutritional science, Christina Archer works closely with Dr. Zerey to deliver this ongoing, integrative approach.

Christina received her masters of science degree from California State University, Chico and is certified by the Academy of Nutrition and Dietetics (AND). She is also a member of the Dietitians in Integrative and Functional Medicine Practice Group, the Oncology Nutrition and Practice Group and the Tri-Counties Dietetics Association.

In addition to providing one-on-one coaching, Christina also leads free monthly weight loss support groups after surgery, helping patients overcome challenges and celebrating their successes.

Jessica Orozco - Bariatric Surgery Program Coordinator

Jessica Orozco, Bariatric Surgery Program Coordinaor

Jessica is here to work one-on-one with you to develop a personalized plan for weight loss success, whether it involves lifestyle changes, medication or a bariatric surgical solution.

During your journey, she'll coordinate your plan of care, including scheduling appointments and navigating insurance coverage; answer any questions you may have; and be your source of comfort and encouragement as you work to achieve your weight loss goals.



Rosana Herrera, LVN – Bariatric Nurse

Rosana Herrera, Bariatric Nurse

Rosana received her LVN license from Santa Barbara City College’s Nursing Program in 2008. After working in various departments with Sansum Clinic, she found her true calling in 2014 when she joined Dr. Zerey and the Bariatric Surgery Team.

Both before and after your procedure, Rosana is here to monitor your progress and provide attentive and compassionate care.