Get to know our surgeons

Meet Our Care Team

At Nashville Surgical Associates, our experienced and highly-skilled surgeons are certified by the American Board of Surgery and are Fellows of the American College of Surgeons. Our team of board-certified and fellowship trained surgeons includes Dr. Jonathan Cohen, Dr. Ray Hargreaves, and Dr. Zachary Callahan. Learn more about our surgeons below.

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Get to know

Dr. Jonathan Cohen

General, Laparoscopic & Cancer Surgery

Dr. Jonathan Cohen performs a wide range of procedures, including those involving: the skin and subcutaneous area, breast, gastrointestinal & proctological, biliary, endocrine, hernia, and much more.

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Dr. Ray Hargreaves

General, Laparoscopic & Cancer Surgery

Dr. Ray Hargreaves specializes in a wide range of procedures, including those involving: hernias, breast cancer, gallbladder, reflux disease, abdominal surgery, skin lesions & skin cancer, colon/rectal disease, anal problems, laparoscopic surgery, and much more.


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Dr. Zachary Callahan

Minimally Invasive General & Bariatric Surgery

Dr. Callahan specializes in minimally invasive general surgery including weight-loss surgery.

He is fellowship-trained in primary and revisional weight-loss surgery including both traditional laparoscopic procedures (sleeve gastrectomy, gastric bypass, duodenal switch) and exciting new incisionless procedures such as endoscopic sleeve gastroplasty, endoscopic revision of gastric bypass, and intragastric balloon placement.

Learn more about our specialties and procedures.


Patient Testimonials

Nashville Surgical Associates really makes you feel like family.



I appreciate so much your gentle, professional bedside manner. You are an excellent doctor!



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