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About Us

About Northwest Houston Surgical Association

NHSA is comprised of General and Bariatric surgeons–all of them with a special interest in advanced laparoscopic surgery. We offer weight loss surgery, gallbladder, colorectal, endocrine, anti reflux, hernia and breast surgery. We also have the capability to perform minimally invasive ultrasound-guided breast biopsies in our office, for the convenience of our female patients. If it is possible to achieve your surgery through a small incision, rest assured that we could do it.

The goal of NHSA is to provide excellent, efficient care to our patients. We take pride in keeping abreast of the most recent and beneficial surgical techniques, staying on the cutting edge of surgical care.

Meet Our Doctors

We’re a dedicated, multi-talented team of surgeons commited to providing excellent, efficient care to our patients . No matter what you need, rest assured knowing we have you covered. Visit the about page to read more about our surgical team.

Dr. Subramanyam Ayyar


Dr. Ayyar has pioneered minimally invasive surgery in the West and Northwest Houston area and is an expert in parathyroid operations.

Dr. Jorge I. Leiva


Dr. Leiva is at the forefront of single incision and robotic general surgery with a special interest in primary and revision, advanced laparoscopic.

Dr. Ziad Amr


As a highly skilled and fellowship trained weight loss surgeon, Dr. Amr is skilled in laparoscopic foregut surgery and bariatric (weight loss) surgery.

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