Arnar Geirsson, MD

Dr. Raghuram “Ram” Posham is a board certified vascular and interventional radiologist in the Department of Radiology at Columbia University Irving Medical Center. He is an assistant professor of radiology and an attending physician at NewYork-Presbyterian Hospital. Dr. Posham's expertise spans a broad range of minimally invasive procedures which enable him to manage and treat a wide range of conditions, from cancer care to men's and women's health. Among his clinical interests are complex portal hypertension in patients with liver disease, benign prostatic hyperplasia (BPH) in men, uterine fibroids in women, and transarterial chemo and radiation therapy for hepatocellular carcinoma patients. Dr. Posham is actively involved in academic research and has made significant contributions to the field of interventional radiology. His research interests encompass trans-radial arterial access, peripheral arterial disease interventions, and complex inferior vena cava filter retrieval techniques. Through numerous peer-reviewed articles in prestigious medical journals, he has enhanced the understanding and practice of interventional radiology, earning recognition for his dedication to advancing medical knowledge. His contributions to the medical community have been recognized with various honors, including the Editor's Award for Outstanding Clinical Research at the Society of Interventional Radiology (SIR) 2017 Annual Scientific Meeting and the Burton Drayer Prize in Radiology and Imaging from the Icahn School of Medicine at Mount Sinai. Dr. Posham served as chief resident in the Integrated Interventional and Diagnostic Radiology Residency at Mount Sinai Hospital. He holds an MD with Distinction in Research from the prestigious Icahn School of Medicine at Mount Sinai. Additionally, he earned an MPA with a specialization in health services management from New York University's Robert F. Wagner Graduate School of Public Service, and a BA in economics, graduating magna cum laude from New York University's College of Arts and Science.

Dr. Dor Lotan is an Assistant Professor of Cardiology specializing in Advanced Heart Failure, Mechanical Circulatory Support, and Transplant Cardiology at Columbia University Irving Medical Center. He provides comprehensive care to patients with heart diseases, particularly those with heart failure who require advanced therapies such as mechanical circulatory support devices, intensive cardiac care, left ventricular assist devices (LVADs), and heart transplantation. Dr. Lotan is also an expert in pericardial diseases, with extensive experience in treating patients with recurrent pericarditis resistant to conventional therapies. He was appointed Director of the Center for Pericardial Diseases, a multidisciplinary program that brings together experts in pericardial and inflammatory heart diseases, incorporating advanced imaging and diagnostics. His clinical interests include heart failure, advanced heart failure therapies, cardiomyopathies, myocarditis, inflammatory heart diseases, autoimmune disorders affecting the heart, pericardial diseases, and cardiovascular hemodynamics. Dr. Lotan divides his time between inpatient and outpatient care, as well as performing advanced procedures in the cardiac catheterization laboratory, including invasive hemodynamic studies and endomyocardial biopsies. Dr. Lotan earned his medical degree with honors from Semmelweis University and completed his Internal Medicine Residency and Cardiovascular Disease Fellowship at Sheba Medical Center in Israel. He then pursued his Advanced Heart Failure Fellowship at Columbia University Irving Medical Center. During his training, Dr. Lotan published numerous scientific papers in peer-reviewed journals and contributed three book chapters, including one in the prestigious cardiovascular medicine textbook by the European Society of Cardiology. He has been invited to present his research at international medical conferences and has participated in European Task Forces and international multicenter prospective studies. Dr. Lotan’s primary research focuses on advanced heart failure therapies, hemodynamics, cardiomyopathies, Myocarditis, and pericardial diseases. Dr. Lotan is a member of the American College of Cardiology, the Heart Failure Society of America, and the International Society of Heart and Lung Transplantation. He also serves on the Board of Directors of the Myocarditis Foundation.

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