About Us

Walden Surgical Associates is a comprehensive general surgery practice that provides a spectrum of procedures, including abdominal and intestinal surgery, breast surgery and melanoma surgery. Atif Khan, MD, Elizaveta Ragulin Coyne, MD, Christopher Schlieve, MD, and Alexandra Columbus, MD, are skilled general surgeons who are highly-regarded and respected by their colleagues and their patients.

Dr. Khan has advanced and refined his ability to perform laparoscopic (minimally invasive) surgery. This approach is associated with less post-surgical pain and a quicker recovery than traditional surgery. He has a special interest in treating diseases of the anus and rectum, which are often misdiagnosed, causing individuals unnecessary pain.

Dr. Ragulin Coyne has experience performing a wide variety of laparoscopic (minimally invasive) surgical procedures, and has trained in the most up to date methods of laparoscopic practice of small bowel, colon disease, and complex hernias. Dr. Ragulin Coyne also has a clinical interest in treating breast cancer and melanoma patients, and patients with thyroid and parathyroid disease needing surgery.

Dr. Schlieve joined the Walden Surgical Associates medical staff in the summer of 2021. His clinical interests include adult and pediatric minimally-invasive general surgery, abdominal wall defects, gastrointestinal and colorectal disease, as well as breast, melanoma, and thyroid/parathyroid surgery.

Dr. Columbus also joined the practice in 2021. She specializes in both general surgery and colorectal surgery. Her expertise will support colon cancer treatment and care in partnership with oncologists at Mass General Cancer Center at Emerson Hospital – Bethke. Her clinical interests include anorectal disease, colonoscopy, colorectal cancer, diverticular disease, inflammatory bowel disease, and pelvic floor dysfunction.

The surgeons are known for communicating clearly and effectively and for being available to their patients. Our physicians strive to explain the procedure and give their patients the time they need to feel comfortable and earn their trust. They are supported by a dedicated office staff who share the same philosophy of patient care. They work together to coordinate your surgery or appointment and see that everything goes smoothly.

Walden Surgical Associates is based at Emerson Hospital, where all surgeries are performed in the impressive Clough Surgical Center. Surgery at Emerson combines the most current technology with the personal touch that patients appreciate.