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Our Physicians

Christopher N. Irobunda, MD



Interventional Cardiology
Cardiovascular Disease (Board Certified, Primary Specialty)
New York Presbyterian

Christopher Irobunda, MD, is a full time faculty member and an assistant professor of medicine at Columbia University College of Physicians and Surgeons and attending physician at NewYork-Presbyterian Hospital. He trained as a general and interventional cardiologist. Dr. Irobunda has been a full-time faculty since 2003. He obtained his MD/PhD in the Medical Scientist Training Program at the Albert Einstein College of Medicine in the Bronx, NY. His PhD was in Molecular Pharmacology specifically on the cyclic Adenosine MonoPhosphate/beta-adrenergic signal transduction system. He subsequently completed internship and residency in internal medicine at New York University Medical Center followed by his General and Interventional Cardiology Fellowship here at Columbia University Medical Center. After completion of his medical training and research study, he shifted his concentration to patient care and the education of aspiring young physicians.

Dr. Irobunda is ardently dedicated to uncompromised patient care and teaching. His primary focus is individualized patient care and patient advocacy. Given his training as a medical scientist, it is hardly surprising that he is a keen diagnostician. He has a penchant for complex cardiac issues and other medical problems that can sometimes mask or aggravate cardiac disease. His aptitude for unraveling these medical conundrums, have led to medical diagnoses for patients who have come to him for second and even third opinions. However, above all else, his true genius is his ability to relate to his patients with intelligence, curiosity, patience, compassion, and humor. His ability to waylay even the most apprehensive of patients with his aura of reassurance and understanding, has garnered him a continually growing medical practice. Again and again, individuals will refer family members and friends because of the empathy and level of care constantly provided. Indeed, his unceasing diligence has led him to become a physician member of Columbia University Medical Centers Patient Facilitated Services, an organization that is directed at patient satisfaction and outreach. Dr. Irobunda has also been the primary cardiologist for patients undergoing liver transpalnt evaluations at New York Presbyterian since 2004.

When not in his private practice, he takes great pleasure in helping train the new influx of physicians in the only ethical way to practice medicine—patient centered care. Dr. Irobunda has been a Supervisor and Attending Faculty for the Fundamentals of Clinical Medicine for First Year Medical Students at Columbia University College of Physicians and Surgeons since 2011, a program which endeavors to instill exceptional patient-doctor communication and trust. He encourages these future practitioners of medicine to listen to the patient and to learn to interpret and analyze the information that is being imported; to realize that the seemingly insignificant details sometimes lead to the culprit of an individual's illness. He has been a lecturer with International Postgraduate Organization for Knowledgetransfer, Research and Teaching Excellent Students (IPOKRaTES) in Europe. IPOKRaTES offers opportunities for physicians from a plethora of countries to observe and gain instruction regarding differing methods in patient care practices. Since the summer of 2012, Dr. Irobunda has become involved in New York Presbyterian Hospital's Lange Youth Program which seeks to prepare and enumerate the rigors of medical school for high school students.

Dr. Irobunda is active in numerous community outreach organizations - Abyssian Baptist Church (NY), JP Morgan Chase Employee Education Program, Riverside Church Seniors, and Sister to Sister: The Women's Heart Health Foundation, to name a few. He seeks to educate the public on cardiovascular issues and ways to make everyday life style modifications to help reduce these risks. In addition to being an interventional cardiologist who can perform angioplasties and stent placements, he emphasizes the prevention and treatment of heart disease through diet, exercise, and medical therapy.


John F. Heitner, MD



Director, Non-Invasive Imaging
Director, Cardiology Fellowship Program
Co-Director, Cardiovascular Research

Dr. Heitner graduated from The University of Wisconsin-Madison in 1993 with a major in Psychology. He attended Albert Einstein College of Medicine for his medical degree and trained at Duke University for internal medicine residency. He split his cardiology fellowship at Emory University and Duke University. He then specialized in cardiac MRI while at Duke. He has been working at NewYork Presbyterian-Brooklyn Methodist Hospital since 2004, where he directs the cardiology fellowship program, the non-invasive section and the cardiovascular research program. His research interests are in cardiac stress CMR.


David Serur, MD

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Nephrology (Board Certified, Primary Specialty)
Internal Medicine (Board Certified)

Dr Serur came to New York Presbyterian Weill Cornell in 1991 with an interest in clinical transplantation and has been Medical Director of the kidney transplant program since 2007. For the past 15 years he has been supervising the evaluations of kidney donors at Cornell, which performs 150 living donations annually. Research interests have included pharmaceutical industry supported studies of new transplant medications as well as investigator-initiated studies. Dr Serur was one of the earliest proponents of offering kidney transplantation to HIV patients on dialysis, something that many thought was too risky but is now routinely done. Recent interests have been in studying non-directed donors and donors within paired exchange. He serves on the editorial board of the journals Transplantation and Progress in Transplantation and served on the medical boards of the NY Organ Donor Network and the Manhattan chapter of TRIO, the transplant recipient organization. He also serves on the board of directors of AFDT (American Foundation for Donation and Transplantation) since 2017. Being involved in kidney paired exchange since its inception at Cornell in 2008, Dr Serur has volunteered as Medical Director of the National Kidney Registry, the largest paired exchange program in the world.

Dr Serur serves on the executive committee of the AST Living Donor Community of Practice and has recently chaired committees in national consensus conferences: the KPD consensus conference and Best Practices in Living Donation conference. Recently he developed an online educational tool kit for living donor transplantation. In March 2016, he visited the White House to advise the White House National Economics Council on ways to promote organ donation and remove disincentives from live donors and then joined the White House Organ Summit in June 2016.


Jai Radhakrishnan, MD

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Nephrology (Board Certified, Primary Specialty)

Amyloidosis

Internal Medicine (Board Certified)

Dr. Radhakrishnan has been on faculty at Columbia University in the Division of Nephrology since 1994. He is both a clinician and a researcher focusing on the epidemiology and treatment protocols for glomerular disease, chronic kidney disease, and critical care nephrology. He is currently the Co-Director of the Glomerular Center at Columbia University Medical Center, and has taken part in conducting a number of observational and experimental studies in glomerular disease. He has overseen many clinical trials including: 1) long-term safety and efficacy of oral Tolvaptan in adults with autosomal dominant polycystic kidney disease; 2) a Membranous Nephropathy Trial Of Rituximab (MENTOR); 3) the efficacy and safety of finerenone on standard care and progression of kidney disease subjects with type 2 diabetes; and 4) an efficacy study of RE-021 in Focal Segmental Glomerulosclerosis.

Dr. Radhakrishnan has gained international recognition in glomerular disease as a result of the publication of original articles, reviews, and textbook chapters, and is a featured speaker in many international conferences. He was on the KDIGO Glomerulonephritis Guideline committee. He has a strong background in biostatistics (clinical research methods), and in his role as editor-in-chief of Kidney International Reports and associate editor of Kidney International, has had the opportunity to be intimately involved in scientific publication. Further, he is on the educational committee and publication for the ISN which has further enhanced his perspective on all the publications of the ISN and their relationships to each other.


Paul G. Lee, MD, MPH

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Internal Medicine (Board Certified)

Paul G. Lee, MD, MPH serves as Medical Director of the Hospitalist Program, the Associate Program Director for the Medical Residency Training Program and is Medical Director for Global Services at NewYork Presbyterian Hospital/Columbia University Medical Center.

He was a recipient of the Physician of the Year Award and named a three-year recipient of the Ewig Clinical Education Award for dedication and excellence in clinical teaching.

Along with his current functions, Dr. Lee has been the Head Team Internist for the New York Yankees since 2007 and is a member of the Major League Baseball Team Physicians Association. Since 2014, he has also served as the Head Team Internist for the New York City Football Club.


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