The Bay Bariatrics Team

Located in beautiful Coos Bay, OR, the highly-skilled team at Bay Bariatrics is here to help you look and feel your best.


Dr. Steven Tersigni

Dr. Steven Tersigni

Steven Tersigni, MD, FACS, is an expert in the field of bariatric surgery. Board certified since 1996, he is also a fellow with the American College of Surgeons, an honor awarded only to proven and accomplished surgeons. In addition to his surgical expertise, Dr. Tersigni fosters a caring and compassionate environment for every patient.

Dr. Tersigni earned his medical degree from the University of Utah in 1990 and completed his internship and residency at the University of Kansas.

A leader in the field of bariatric surgery, he is certified by the American Board of Surgery and has served as president of the Oregon Society of Metabolic and Bariatric Surgery. Dr. Tersigni has practiced bariatric surgery longer than anyone else in Oregon and serves as a mentor to other bariatric surgeons.

Dr. Tersigni is a member of multiple professional associations, including the American Medical Association, American College of Surgeons, Southwestern Surgical Congress, and the Oregon Chapter of the American College of Surgeons, and has been president of the American Society of Metabolic and Bariatric Surgery.

Dr. Tersigni and his wife Lori live on Oregon’s south coast and enjoy spending time with their three children and grandchildren.



Robin Stephenson, RN

Robin Stephenson, RN

Robin Stephenson is a registered nurse, wife, and mother of five children. She is the program coordinator for Bay Bariatrics and has personally benefited from bariatric surgery, losing more than 100 pounds and maintaining her weight loss for more than 14 years.

Robin Stephenson is a member of the American Nurses Association, Oregon Nurses Association, and American Society for Metabolic and Bariatric Surgery.

Outside of work she enjoys traveling, entertaining, reading, skiing, water sports, and furthering her education.


Hazen Herzog, PA-C

Hazen Herzog, PA-C

Hazen Herzog is a board-certified physician assistant. He graduated from the University of Utah School of Medicine in 2009 with a Master of Physician Assistant Studies degree. He and his wife and children have lived on the Oregon coast since 2010. He enjoys salmon and steelhead fishing, fly fishing, bicycling, snow skiing and exploring the Oregon coast with his family. He is also fluent in Spanish.



Dr. Tersigni did my operation, and I am so grateful that my postop has been almost completely uneventful and pain-free. I’ve lost more than 100 pounds from my high weight, and my diabetes, which I had for 10 years, appears to be cured. The good doctor and his staff have been so caring, and words cannot express my gratitude.*
—Jerry Christean, Florence, Oregon
*Results may vary by patient.