The staff at Oregon Weight Loss Surgery, LLC is dedicated to providing the highest quality care for every patient that enters our clinic. We strive to understand the needs of the bariatric patient and cater to them through our friendly and accessible office personnel. We are here to ensure that you receive high quality medical care at the time of your surgery and at every office visit. Our staff members have dedicated their lives to helping bariatric patients live a healthier and more fulfilling life.

Dr. Emma Patterson


Dr. Emma Patterson developed a passion for bariatric surgery during her fellowship in advanced laparoscopic surgery at Mount Sinai Hospital in New York City. She has more than 10 years of experience and performed over 3,000 bariatric surgeries.

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Dr. Daniel Tseng


A native Oregonian, Dr. Tseng received his undergraduate degree in Biomedical Engineering from Northwestern University. He continued to receive his medical degree from the University of Illinois at Chicago. Returning to Oregon, Dr. Tseng completed his internship and residency at Oregon Health and Sciences University and continued on at OHSU to complete a fellowship in Advanced Minimally Invasive Surgery where he presented and published numerous papers.

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Michele Bergmann


Michele Bergmann is the newest member of our team. Her desire is to empower and encourage her patients to achieve health and wellness by applying the science of medicine to their lives.

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Lisa Kensil


Lisa was drawn to the area of Bariatric Surgery because of her love for nutrition; exercise and helping others achieve and maintain weight loss goals, as well as improve their medical comorbidities and quality of life. The health and wellness of patients is her most important priority at Oregon Weight Loss Surgery.

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Dulcie Ward


Dulcie Ward, Dietitian at Oregon Weight Loss Surgery, is both a certified diabetes educator and registered dietitian.

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Dr. Douglas Babbitt

Chiropractic Physician

Dr. Doug Babbitt performs fitness evaluations for all new patients and also provides on going follow up care for all OWLS patients.

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