General and Colorectal Surgeons Join Walden Surgical Associates

New Physicians at Walden Surgical Associates

General surgeons Alexandra Columbus, MD, and Christopher Schlieve, MD, recently joined Walden Surgical Associates at Emerson Hospital. Walden Surgical is also home to surgeons Elizaveta Ragulin Coyne, MD, and Atif Khan, MD.

Dr. Columbus 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.

She received her medical degree from Thomas Jefferson University and completed her residency in general surgery at Brigham and Women’s Hospital. She also completed a fellowship in colorectal surgery at Lahey Clinic and received a master’s degree in public health from the T.H. Chan School of Public Health at Harvard University. In her time outside of the hospital, Dr. Columbus enjoys outdoor adventures with her friends and family.

“I am pleased to be part of the outstanding team at Walden Surgical Associates and work closely with clinicians at Mass General Cancer Center at Emerson Hospital to ensure patients have the best outcomes,” said Dr. Columbus.

Dr. Schlieve specializes in adult and pediatric general surgery, complex abdominal wall and hernia procedures, and gastrointestinal and colorectal disease. He received his medical degree from Duke-NUS Medical School in Singapore, completed an internship at the Mayo Clinic, and joined the general surgery residency program at UMass Memorial.

He sought advanced training in pediatrics and completed a fellowship in pediatric colorectal surgery at Children’s Hospital Colorado. Dr. Schlieve is board certified in general surgery. Outside of the hospital, Dr. Schlieve enjoys hiking, cycling, kayaking, scuba diving, traveling the world, and spending time with his family.

“I enjoy working with patients to help them regain their life and reach their physical goals following surgery,” said Dr. Schlieve. “I am excited to join the Walden Surgical Associates family and provide exceptional care for adults and children in the community. As a part of the Emerson health system, I strive to provide a truly patient-centered experience alongside outstanding surgical staff, nursing care, and rehabilitative therapists.”

To make an appointment with the surgeons, please visit or call Walden Surgical Associates at 978-287-3547.