Campbell, Melanie E NP

Fiona Nugent is a licensed Registered Nurse and Board Certified Nurse Practitioner. Fiona serves as Dr. Christopher Ahmads Nurse Practitioner. The two work closely together to specialize in elbow, shoulder, and sport-related injuries.Fiona earned a Bachelors of Science in Molecular Neuroscience from Binghamton University in 2013. At Binghamton, she competed at the Division I level in track and field, specializing in the pole vault and middle distances. She then continued her studies at Columbia University, where she obtained her nursing degree in 2014 and went on receive a Masters of Science degree as a Family Nurse Practitioner in 2015. Fiona holds a Nurse Practitioner specialty certification in Orthopedics and Sports Medicine from Duke University, and is nationally certified as a FNP with the American Nurse Credentialing Center.Fiona began her career as a Registered Nurse while working at Montefiore Medical Center from 2015-2016. She discovered her passion for orthopedics while completing her clinical rotation for her degree at Columbia Orthopedics with Team Ahmad. Additionally, Fiona worked as Assistant Track and Field Coach at The Ursuline School and Iona Preparatory from 2014-2016.Fiona currently resides in Westchester and enjoys competing in track and field and triathlons in her free time. Due to her active lifestyle, she understands the importance of getting back to activities that bring joy to her patients lives.

Justin K. Greisberg, MD, is an orthopedic surgeon specializing in foot and ankle reconstruction and complex musculoskeletal trauma. Dr. Greisberg is Chief of Foot & Ankle Orthopedics, Chief of Orthopedic Trauma, at NewYork-Presbyterian-Lawrence Division, and Professor of Orthopedic Surgery, Columbia University. Dr. Greisberg is an expert on complex reconstructive surgeries, limb realignment, diabetic reconstruction, Achilles tendon injuries, stress fractures, and total ankle replacement. His practice leverages advanced minimally invasive arthroscopic techniques, combined with the latest medications, braces, and orthotics to ensure accelerated recovery times. Following medical school and residency training, Dr. Greisberg completed advanced fellowship training in both foot and ankle surgery and orthopedic trauma. As chief of the foot and ankle service at Columbia University Irving Medical Center, Dr. Greisberg's practice – based in Manhattan and Westchester County – is supported by the full resources of the NewYork-Presbyterian Hospital system, and he frequently receives emergency trauma cases from across the region. In addition to his clinical practice, Dr. Greisberg is also a highly respected scholar who is conducting several research trials on foot and ankle procedures and trauma surgery. He co-authored a textbook, Core Knowledge in Orthopedics: Foot and Ankle, and numerous peer-reviewed articles that have appeared in professional medical journals. Dr. Greisberg is actively involved in the education of medical students and orthopedic residents and is frequently invited to lecture on complex problems of the foot and ankle at major medical conferences.