Surgeons at Andover Surgical Associates
Nancy Cho Landay, MD, FACS
A graduate of Yale University and Washington University School of Medicine in St. Louis, Dr. Landay completed her residency in general surgery at Beth Israel Hospital (now Beth Israel Deaconess Medical Center) in Boston. She then completed a one-year position as surgical coordinator for Beth Israel’s Department of Surgery as a staff surgeon and instructor of surgery at Harvard Medical School.
Dr. Landay joined Andover Surgical Associates in 1995, practicing all aspects of general surgery but with a special interest in breast surgery. Since September 2017, she has focused exclusively on breast care and evaluation and surgical management of breast cancer and other breast disease, using minimally invasive techniques and oncoplastic surgical techniques including breast conservation, skin-sparing and nipple-sparing mastectomy. A member of the American Society of Breast Surgeons (ASBS), Dr. Landay is certified in breast ultrasound, ultrasound-guided breast biopsies and stereotactic breast biopsies with the ASBS. She is also certified in Hidden Scar Breast Surgery techniques by Invuity and offers Biozorb marker placement for breast cancer surgery. She is certified by the American Board of Surgery.
A longtime Andover resident, Dr. Landay is a Yoga Alliance-registered yoga teacher (RYT 200) and enjoys singing with local choruses.
Earl R. Gonzales, MD, FACS
Dr. Gonzales was born in Manila and is a graduate of the University of the Philippines with a bachelor's degree in Zoology. He obtained his medical degree at the University of the East with top honors. He finished his first general surgery residency in the Philippine General Hospital.
He moved to Maryland in 2004 and did a research fellowship in trauma at the Uniformed Services University in Bethesda. He then completed his second general surgery residency at the University of Massachusetts in Worcester.
Dr. Gonzales has over 15 years of experience in general surgery. He is one of the rare breed of surgeons who are well-trained in both open cases as well as minimally invasive surgery. He has special interests in laparoscopic colorectal, complex hernia surgery, acute care and trauma.
He is currently the trauma medical director of the Lawrence General Hospital. He is certified by the American Board of Surgery and a fellow of the American College of Surgeons. He is also an advanced trauma life support instructor.
He lives in Andover with his wife and three children. In his spare time, Dr. Gonzales enjoys hiking, cooking and even singing. He is an avid fan of the New England Patriots and Boston Celtics.
Syed Abbas, MD
Dr. Syed Abbas brings with him a wealth of experience and a distinguished career in the medical field. Formerly associated with the Northport Veterans Affairs Medical Center in New York, Dr. Abbas has demonstrated a commitment to patient care and surgical excellence. Dr. Abbas completed his residency at SUNY - Stony Brook and later completed specialized training at the University of Florida in Jacksonville, focusing on advanced minimally invasive surgery and surgical oncology. He also holds a master’s in business administration from Auburn University.
Dr. Abbas’ commitment to continuous learning and professional development is exemplified by his active memberships in esteemed organizations such as the American College of Surgeons, the Society of American Gastrointestinal and Endoscopic Surgeons, and the American College of Healthcare Executives.
When not in the operating room or engaging in academic pursuits, he cherishes quality time with his family and nurtures his passion for exploration and cultural immersion. Having already journeyed to over 15 countries, Dr. Abbas embodies an inquisitive spirit, appreciating the diverse perspectives and experiences that the world has to offer.
Here at Lawrence General, Dr. Abbas contributes to the hospital’s surgical oncology, colorectal surgery, trauma surgery and laparoscopic surgery efforts.
David Ma, MD
Dr. David Ma is a skilled general surgeon specializing in colon and rectal surgery. He trained in general surgery at St. Elizabeth’s Medical Center and completed his colon and rectal surgery fellowship at Rutgers University – Robert Wood Johnson. A member of the American Society of Colon and Rectal Surgeons and the Massachusetts Medical Society, Dr. Ma actively contributes to the medical community and health care policy. His patient-centered approach ensures that individuals receive personalized care tailored to their unique needs.
Dr. Ma began his academic journey with a bachelor's degree in journalism from Northwestern University and earned his medical degree from the University of Massachusetts Medical School. He also holds a master's in public health from Tufts University. As a postdoctoral research fellow at the Massachusetts General Hospital Center for Transplant Sciences, Dr. Ma investigated xenotransplantation with porcine kidneys and mechanisms of tolerance in kidney transplantation.
Beyond his clinical practice, Dr. Ma has experience in teaching and mentoring and is dedicated to fostering the next generation of health care professionals and improving community health through education.
In his free time, Dr. Ma enjoys spending time with his niece and nephew as well as hiking, fitness, baking and gardening.