Erik Ekstrom, MD

Dr. Ekstrom believes in listening to patients and making them feel comfortable. The most gratifying part of the work is finding the problem and fixing it so patients can return to their usual activities.

TJ Ridley, MD

Given Dr. Ridley’s specialized training and breadth of experience, he performs a unique set of surgical treatments when non-surgical treatments have failed. He firmly believes in listening to his patients so he can better understand their needs, limitations, and goals.

Robotic Surgery

We are excited to announce our new service of robotic surgery with the da Vinci Surgery System!  On January 5, 2021 we performed two; an Inguinal Hernia Repair with Dr. Kern and a Cholecystectomy with Dr. Jenabzadeh. Utilizing a robot vs. traditional open surgery results in less pain and a faster recovery for our patients. Congratulations to the NMASC team for this accomplishment!


Casey Fisher, DO

Since an early age, Dr. Fisher knew he was interested in medicine. As a surgeon, he appreciates “that we often don’t know what we have until it’s gone. When we lose a vital function such as the ability to hear, smell, breathe, taste, speak or swallow, it is incredibly rewarding to help a patient regain that function.”  Welcome!

Rebecca Mullin, DPM

Matthew Butterfield, MD

Abigail Hamilton, MD

Meet David R. Edwards, MD

David R. Edwards, MD, is a general orthopedist with special interests in knee, hip and shoulder joint replacement, sports medicine, fracture care and arthroscopy.  Dr. Edwards is board certified in Orthopedic Sports Medicine.

Meet Dr. Sage!

Dr. Sage is a board-certified Gastroenterologist with special interests in Interventional Endoscopy/ERCP, Gastrointestinal Oncology, Diseases of the Pancreas and Biliary system and inflammatory bowel disease management.

He believes in providing excellent clinical care combined with the utmost respect and humanity. He strives to meet his customers’ needs, whether consulting over the phone or at the hospital bedside; his priority is to make sure each customer has a wonderful experience.

In his free time, Dr. Sage enjoys watching movies, playing tennis, weight lifting and spending time with family.

Dr. Yamaguchi – Pain Management

Dr. Mark Yamaguchi is board certified in pain management and anesthesiology with fellowship training in pain management. Dr. Yamaguchi believes in a cohesive and integrated approach to address chronic pain disorders.

Special Expertise is in non-operative spine (low back and neck pain) and fluoroscopically guided injections for low back and neck pain.

The North Memorial Ambulatory Surgery Center welcomes Dr. Yamaguchi!