Our Team


Miguel Silva, MD, FACS – Bariatric and General Surgery

Director, Center for Advanced Surgery at NewYork-Presbyterian/Lawrence Hospital
Assistant Clinical Professor of Surgery, Columbia University College of Physicians and Surgeons

Miguel Silva, MDDr. Silva specializes in minimally invasive bariatric and general surgery. He is known as one of the early adopters of the gastric sleeve technique and is among the most experienced surgeons in the New York area in Laparoscopic Sleeve Gastrectomy. He received advanced training in laparoscopic surgery at Baptist Hospital in Miami, FL. He completed his medical training at Albert Einstein College of Medicine / Montefiore Medical Center, Mount Sinai School of Medicine and University of Medicine and Dentistry of New Jersey / Robert Wood Johnson.

John-Paul Salvatore Bellistri, MD – Bariatric and General Surgery

Assistant Professor of Surgery at CUMC

John-Paul Salvatore Bellistri, MDJohn-Paul Bellistri, MD, is part of NewYork-Presbyterian/Columbia University Irving Medical Center as a specialist in General Surgery, Laparoscopic Surgery, and Bariatric Surgery. Dr. Bellistri will be practicing at the NewYork-Presbyterian Lawrence Hospital in Bronxville, New York in the Center for Advanced Surgery.

A native New Yorker, Dr. Bellistri received his undergraduate degree at Columbia University in biochemistry. He later obtained a master degree in biotechnology and dedicated three years to conducting research in esophageal cancer prevention. After graduating from SUNY Downstate College of Medicine, he completed both a general surgery residency and an advanced GI/minimally invasive surgery fellowship at Montefiore Medical Center.

His areas of expertise include general surgery, minimally invasive surgery, and bariatric surgery. His focus includes both benign and malignant diseases of the gastrointestinal tract.

Makram Gedeon, MD – Bariatric and General Surgery

Makram Gedeon, MDMakram Gedeon, MD, is a double board-certified bariatric and colorectal surgeon specialized in minimally-invasive approaches to colorectal and bariatric surgery. Dr. Gedeon is part of both the Colorectal Surgery team at several locations throughout New York and New Jersey and the Center for Advanced Surgery at Lawrence Hospital and Hudson Valley.

Dr. Gedeon received his medical degree from the American University of Beirut in 2002 before completing an internship in surgery at the Mayo Clinic and a general surgery residency at the University of Texas Southwestern. He has undergone two fellowships - one in minimally-invasive surgery at the University of Texas Southwestern and another in colon and rectal surgery at NewYork-Presbyterian. Following his residency training, Dr. Gedeon spent ten years in a busy community hospital practice in Bristol, Connecticut, where he helped start and grow the practice’s weight loss surgery program and served as its medical director until the end of 2018.

Clinically, Dr. Gedeon is interested in the application of minimally-invasive and robotic surgery to treat colorectal diseases and obesity, specializing in bariatric surgery and revisions. His research focuses include surgical technology and clinical outcomes. He is fluent in English, Arabic and French.

Arpan Goel, MD – Bariatric and General Surgery

Arpan Goel, MDDr. Goel completed his medical degree and internship in India, followed by residencies in West Virginia and Albert Einstein College of Medicine, Montefiore Medical Center. He completed his first fellowship at the Department of Plastic Surgery/Burn at Jacobi Medical Center, Bronx, and a second fellowship at Beth Israel Deaconess Medical Center, Boston, in minimally invasive and bariatric surgery.

His appointments prior to arriving at Columbia include Attending Surgeon at WestMed Medical Group and at Harlem Hospital Center. Dr. Goel received the 2014 Attending Teaching Award at Harlem Hospital Center, and was named Outstanding Resident Teacher three years in a row at Montefiore Medical Center (2005 – 2007). Dr. Goel has a special interest in abdominal wall hernia repair and bowel wall reconstruction.

Ayodeji Nubi, MD

Ayodeji Nubi, MDAyodeji O. Nubi, MD, is a board-certified surgeon specializing in open, laparoscopic and robotic-assisted general surgery. He completed his surgical residency training at Westchester Medical Center, Valhalla and Advanced Trauma and Surgical Critical Care Fellowship at the University of Pittsburgh Medical Center. Prior to arrival in the United States, Dr. Nubi completed a surgical residency in the United Kingdom. 

Dr. Nubi has specific advanced training in acute care/ emergency general surgery, trauma, and critical care in the surgical setting. He has been in established hospital-based and elective practice in Pennsylvania and New York prior to his arrival to Columbia University. He is a published author, most recently having contributed to the textbook Pathophysiology and Management of Thoracic Injury

As part of the Center for Advanced Surgery, Dr. Nubi sees patients at the New York-Presbyterian/Lawrence Hospital. He is known for his compassionate and patient-centered approach to care, citing “when patients return home feeling better than when they arrived in the hospital as the best part of being a surgeon”. 

Dr. Nubi grew up in Nigeria, where he completed his undergraduate degree in medicine and surgery at Olabisi Onabanjo University. In his spare time, Dr. Nubi participates in tennis, soccer, and snooker- all sports he still actively enjoys.

Nurse Practitioners

Kathryn Pisseri, FNP-BC

Kathryn Pisseri, FNP-BCKathryn Pisseri, FNP-BC is a board certified Family Nurse Practitioner and Clinical Coordinator specializing in Bariatric Surgery. She has worked at NewYork-Presbyterian/Lawrence Hospital as a Registered Nurse since 2009 and has worked in medical, surgical and emergency settings. She received her Bachelors of Nursing degree at Dominican College of Blauvelt, NY and completed her Master of Science degree as a Family Nurse Practitioner at Pace University. Katie thoroughly enjoys working with her patients and the entire bariatric team to deliver the best care possible.

Registered Dietitian

Lucrezia Scarampi, MS, RD, CDN

Lucrezia Scarampi, MS, RD, CDNLucrezia Scarampi is the Bariatric Dietitian at the Center for Advanced Surgery. She received her Master’s degree in Human Nutrition from the University of Bridgeport and completed her dietetic internship through Stony Brook University. She is fluent in both Spanish & Italian, which helps her effectively serve our culturally diverse patient population. Lucrezia combines her passion for food and nutrition with her commitment and dedication to helping her patients lose weight and live healthier, more fulfilled lives.