Dr. Oliak is a board-certified, fellowship-trained bariatric surgeon who has been in practice in Orange County since 2002, and has completed >2500 weight loss operations. Dr. Oliak’s approach is to combine thorough education, expert surgery, comprehensive follow-up, and ongoing support to achieve not just good patient outcomes, but excellent, industry-leading patient outcomes.

Why Dr. Oliak?

What sets Dr. Oliak apart from others is his actual patient outcomes – outcomes after weight loss surgery vary by surgeon, and Dr. Oliak’s outcomes rank among the best.*
More about outcomes

The Next Step

The next step to learn more about surgery and our program is to schedule an informational consultation with Dr. Oliak in Brea or Irvine. It is free and there is absolutely no obligation.*
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Career – Orange County Bariatric Surgeon Dr. Oliak

Dr. Oliak’s philosophy has always been to treat patients how he would want to be treated himself. This means achieving industry-leading excellent weight loss results and low complication rates.*

Over the course of his career, Dr. Oliak has seen that excellent weight loss surgery outcomes are not universal, and very surgeon dependent.

A new study published in April 2017 in JAMA (Journal of the American Medical Association) provides us with the strongest evidence yet that variation in outcomes between surgeons is a very real concern. In this large study (145,527 patients), the rate of serious complications within one month of surgery was found to vary 17-fold (0.6% – 10.3%) across 165 accredited bariatric surgery center of excellence programs nationwide.
Read study abstract
Read more about study

This is a shocking and disturbing finding. How can the rate of serious complications vary over such a wide range across programs that are accredited centers of excellence? The answer is simple – there are different surgeons at the different programs, and some are better than others. Also, importantly, the center of excellence accreditation process ignores actual surgeon outcomes.*
Outcomes vary between surgeons
Why outcomes vary between surgeons

Dr. Oliak’s approach of prioritizing great outcomes has resulted in a long record of great outcomes. His outcomes statistics for weight loss results and complication rates rank among the best in the weight loss surgery field.*
More about our outcomes

Using the same methodology as used in the JAMA study above, Dr. Oliak’s rate of serious complications is less than 1%, which places Dr. Oliak’s Orange County weight loss surgery program in the top decile of the 165 programs evaluated in the study.*

Professional Accomplishments – Orange County Bariatric Surgeon Dr. Oliak

Dr. Oliak’s most important accomplishment is the help he has given to 1000’s of patients to lose weight and improve their lives.

Other accomplishments over the course of his career are listed below:

Dr. Oliak was the first Orange County bariatric surgeon to complete a laparoscopic bariatric surgery fellowship, and one of the first Orange County bariatric surgeons to routinely perform laparoscopic gastric bypass surgery rather than open gastric bypass surgery.

Dr. Oliak has started and built two successful center of excellence bariatric programs in Orange County, one at Chapman Medical Center, and one at Placentia-Linda Hospital.

Dr. Oliak has published numerous outcomes-focused research studies, including studies on the learning curve for laparoscopic bariatric surgery, studies on outcomes for higher BMI patients, and studies on outcomes for older patients. Dr. Oliak has published his research in numerous scientific journals and has presented his data at national and international surgical meetings.

Dr. Oliak is a sought out weight loss surgery expert. He is a bariatric surgery consultant and bariatric surgery expert witness for bariatric surgery malpractice matters. He has appeared on national television shows, including The View and The Tyra Banks Show, and on local news stations, including KCAL and CBS.

Background – Orange County Bariatric Surgeon Dr. Oliak

Dr. Oliak attended college at prestigious Northwestern University in Chicago, where he obtained his Bachelor of Science degree in chemical engineering. After an engineering internship at Procter and Gamble, he changed course and decided instead to pursue his lifelong dream of becoming a doctor by attending top-ranked Washington University School of Medicine in St. Louis.

After medical school Dr. Oliak completed a six year General Surgery residency at Harbor-UCLA Medical Center in Los Angeles. It was during this time that he decided that he wanted to become a bariatric surgeon.

The most common operation for weight loss at that time (late 1990’s) was open gastric bypass. Dr. Oliak thought this was a fantastic operation. With this one operation, patients could lose substantial weight and significantly improve their health. This resulted in very happy patients.

The decision to become a bariatric surgeon was easy, but Dr. Oliak wanted to learn to do the operations laparoscopically. At the time, open gastric bypass was the standard of care, and laparoscopic gastric bypass was considered experimental. Dr. Oliak’s belief was that if laparoscopic gastric bypass could be done safely, it would revolutionize the field of bariatric surgery.

After residency training Dr. Oliak continued on to a one year laparoscopic surgery fellowship at Hackensack University Medical Center in New Jersey to learn laparoscopic gastric bypass. This fellowship was one of the first laparoscopic surgery fellowships in the country to focus on laparoscopic weight loss surgery.

After finishing his fellowship training in 2002, Dr. Oliak returned to California to start his career as a Los Angeles and Orange County bariatric surgeon.

* Patient results vary after weight loss surgery. Individual patients can do better or worse than the average. To read more about the patient’s role in achieving success, click here.

** Leaks can occur after gastric surgery. Past performance is no guarantee of future results. Dr. Oliak’s 0% leak rate statistic applies to primary (non-revision) sleeve gastrectomy, primary (non-revision) laparoscopic gastric bypass, LAP-BAND® conversion to sleeve gastrectomy, and LAP-BAND® conversion to gastric bypass.

  • 13+years experience
  • 2500+weight loss operations
  • 0%leak rate**
Dr. Oliak’s Blog

Orange County bariatric surgeon Dr. Oliak

Variation in Outcomes at Bariatric Surgery Centers of Excellence

A new study published in the Journal of the American Medical Association reports a shockingly wide variation in patient outcomes across accredited bariatric surgery centers of excellence nationally. Claims data were analyzed from 145,527 patients who underwent weight loss surgery at one of 165 accredited bariatric surgery centers of excellence


Gastric Sleeve Patient Outcomes - Update 2016

It's a new year which means it is time to evaluate my performance for the previous year, and update my outcomes statistics. This is am important and ongoing part of my practice. My #1 goal since starting my weight loss surgery practice in 2002 has been to achieve not just


The cost? Losing weight and gaining health is easier than you think.

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Call 714-582-2530 or submit the following information to request a free consult. If you have insurance coverage for weight loss surgery (or are self-pay), and you meet the BMI criteria for surgery, we will schedule you for a 30-40 minute educational consultation with Dr. Oliak.

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