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Our Faculty

Vascular Surgeons

  • Section Chief

    Surgeon-in-Chief, Vascular Surgery, Surgery

    Dr. Guzman is Chief, Division of Vascular Surgery at Yale New Haven Hospital. He is also Surgeon-in-Chief, Vascular Surgery, Heart and Vascular Center for the Yale New Haven Health System. He came to Yale from Beth Israel Deaconess Medical Center and Harvard Medical School. Prior to moving to Boston, he spent the early portion of his career at Vanderbilt Medical Center in Nashville, Tennessee where he served for several years as Chief of Vascular Surgery at the Nashville VA Hospital. He received his medical degree from the Johns Hopkins University in Baltimore, MD. After completing his residency in general surgery, he undertook research training in the Cardiology Branch of the National Heart, Lung and Blood Institute at the National Institutes of Health in Bethesda, MD and subsequently completed a fellowship in vascular surgery at Stanford University Hospital. He currently serves as a permanent member of the Bioengineering, Technology, and Surgical Sciences Study Section of the NIH. His clinical interests relate to patients with diabetic vascular disease and ischemic foot ulcers. His research focuses on the role of arterial calcification in lower extremity ischemia.

  • Assistant Professor of Surgery (Vascular)

    Edouard Aboian, MD, is a vascular surgeon who specializes in aortic and limb preservation procedures, offering endovascular and open surgical solutions—sometimes a combination of the two—as well as medical therapies depending on the patient’s needs.

    “I try to work not just with the patient, but with the entire family to put them at ease in what can be a difficult situation,” he says. “In many cases, I want them to understand that they have something that is treatable. We deal with these things every day, and we often can improve or completely reverse the problem that they have. It can be fixed.”

    In many cases, treatment for aneurysms and other vascular problems has become easier with minimally invasive endovascular approaches, which involve working through small incisions in the groin or sometimes the arm, Dr. Aboian says. “Inside the body there is big work done, but outside, you only see little incisions.” Endovascular techniques often allow patients to recover quickly and even go home the next day after an aortic aneurysm repair, although some stay longer if the operation was complex, he says.

    Dr. Aboian has been involved in research and quality improvement in vascular surgery on a national level. “This gives us granular data to analyze our work and see what we are doing well and what we can improve,” he says.

    But he says the best part of his work is always making a patient better. “Years after treatment, a patient will come back for a follow-up appointment or send me a card, and say, ‘Thank you very much. Because of you, I'm alive today.’ This is the most rewarding thing,” he says.

  • Assistant Professor of Surgery (Vascular)

    Dr. Jonathan Cardella is a vascular and endovascular surgeon who specializes in advanced endovascular and open surgery for critical limb ischemia and diabetic atherosclerotic disease. He also has extensive experience in complex endovascular surgery for aortic aneurysms and lower extremity occlusive disease, as well as hybrid surgical techniques for PVD, varicose veins, and dialysis access.

    Dr. Cardella earned his undergraduate degree at Wilfrid Laurier University and his medical degree at the University of Toronto. He completed his endovascular surgery training at the Cleveland Clinic and fellowship training in vascular surgery at the University of Toronto. After completing his training, he joined the University of Toronto as a staff vascular and endovascular surgeon.

    Dr. Cardella’s research interests include surgical education, simulation, course design, and milestone skill training. He has written numerous research publications and given many presentations on his work. Previously, he chaired the Canadian Endovascular Skills Summits at the University of Toronto as well as served on its residency committee.

  • Assistant Professor

    Uwe Fischer, MD, PhD, is an assistant professor of surgery in the vascular division. He is seeing patients at Lawrence + Memorial Hospital in New London, Westerly Hospital, Rhode Island and additional offices. He is a board-certified general surgeon and board-certified in vascular surgery, and is a registered vascular specialist in the interpretation of vascular laboratory studies. Dr. Fischer’s clinical interests include varicose veins, aneurysms, carotid disease, peripheral arterial disease, peripheral venous disease, dialysis vascular access, endovascular surgery and lower extremity limb preservation, particularly in diabetic patients. He completed his graduate and medical degrees at the University of Mainz, Germany. He spent his general surgery residency at the Memorial Hermann Hospital, University of Texas-Houston – Medial School at Houston, and subsequently finished a fellowship in Vascular and Endovascular surgery at The Houston Methodist Hospital.

  • Associate Professor of Surgery (Vascular); Co-Director, Vascular Malformations Program (VaMP); Associate Professor of Surgery (Vascular), Vascular Surgery and Endovascular Therapy; Chief, Vascular & Endovascular Surgery, VA Connecticut Healthcare System

    Dr. Nassiri received his undergraduate degree at the University of California, Irvine (UCI) and attended medical school at the Oregon Health & Science University (OHSU).  He completed his surgical internship at the University of California, Los Angeles (UCLA) and was subsequently selected as one of the first few individuals in the country into the then newly established integrated vascular & endovascular surgery residency program, graduating in 2013 from the New York Heart & Vascular Institute at Lenox Hill Hospital.  He was then recruited to Rutgers Robert Wood Johnson Medical School as the first integrated-trained vascular surgeon in the state of New Jersey.  There, in addition to practicing the entire gamut of vascular and endovascular operations, he was able to found, direct, and grow a number of collaborative, multidisciplinary programs including the reputable Vascular Anomalies & Malformations Program (VAMP).  

    Here at Yale, Dr. Nassiri focuses his practice on the endovascular repair of complex thoracic, abdominal, and thoracoabdominal aortic aneurysms; extracranial cerebrovascular pathologies; and the comprehensive management of vascular malformations. 

    He serves as the Director of Clinical Research for Vascular Surgery within the Yale New Haven Hospital Heart & Vascular Center and is a member of the Editorial Board of the Journal of Vascular Surgery.  

  • Associate Professor of Surgery (Vascular)

    Cassius Iyad Ochoa Chaar, MD, MS, is an associate professor of surgery in the division of vascular surgery and endovascular therapy. He is seeing patients at the Yale Physicians Building. He is a board-certified in general surgery and vascular surgery, and is a registered vascular specialist in the interpretation of vascular laboratory studies. Dr. Chaar’s clinical interests include peripheral artery disease (PAD) focusing on patients with critical limb ischemia and limb salvage, varicose veins, aortic and visceral aneurysms, carotid disease,  deep vein thrombosis, and dialysis vascular access. He completed his graduate and medical degrees at American University of Beirut, Lebanon. He spent his general surgery residency at Yale-New Haven Hospital, and subsequently finished a fellowship in vascular and endovascular surgery at University of Pittsburgh Medical Center.

  • Assistant Professor

    Dr. David S. Strosberg is an Assistant Professor of Surgery in the Division of Vascular and Endovascular Surgery at Yale New Haven Hospital. He completed his vascular surgical fellowship at the Johns Hopkins Hospital in Baltimore, MD, and general surgical residency at The Ohio State University in Columbus, OH where he served as administrative chief resident.

    Dr. Strosberg’s clinical interests include open, endovascular, and hybrid treatment approaches to complex aortic disease, carotid artery stenosis, critical limb ischemia and limb preservation, dialysis access, thoracic outlet syndrome and vascular compression syndromes, and venous disease and reconstruction. He has a particular concentration in patients with degenerative aneurysmal disease and connective tissue diseases.

    Dr. Strosberg’s research interests include the role of simulation and curriculum development in medical student and resident education. He has received numerous teaching awards for his efforts on the institutional, regional, and national level. 

  • Professor of Surgery (Vascular) and of Radiology and Biomedical Imaging and of Medicine (Cardiology); Associate Director, Graduate Medical Education

    Dr. Bauer Sumpio received his medical degree and his Ph.D. in Physiology in 1981 from Cornell University Medical College in New York. He was involved in post-graduate training in General Surgery at Yale University and from 1986 to 1987 he underwent fellowship training in Vascular Surgery at the University of North Carolina. Dr. Sumpio then returned to Yale School of Medicine, Section of Vascular Surgery, as a faculty member at the VA Connecticut. His professional society memberships include the American Surgical Association, International College of Angiology, Society for Vascular Surgery, American College of Cardiology, Society for Vascular Medicine and Biology, American College of Surgeons, Society for University Surgeons, European Society for Vascular Surgery, Biomedical Engineering Society, American Heart Association and the American Physiological Society. He is a past Chair of the Research Council of the Society for Vascular Surgery and Secretary of the Association of Program Directors of Vascular Surgery. He has been on the editorial board of several journals, including the Journal of Vascular Surgery, Journal of American College of Surgeons, and Cell Transplantation. He has had continuous research funding from the National Institutes of Health, the Veterans Administration and the American Heart Association since 1988 for his studies on the role of hemodynamics and vascular disease. He has published over 345 peer-reviewed papers and has edited and authored 4 books on vascular surgery and biology. Dr. Sumpio is the proud recipient of many prestigious honors and awards such as Best Doctor in NY 2006-2016 -- just to name a few.

  • Associate Professor of Surgery (Vascular); Associate Program Director, Vascular Residency, Vascular Surgery and Endovascular Therapy; Associate Professor, Surgery

    Dr. Tonnessen graduated from Brown University with honors in Neuroscience in 1994. She subsequently received her medical degree at the Mayo Clinic in Rochester, MN. She completed a residency in general surgery and fellowship in vascular surgery at the Ochsner Clinic in New Orleans, and has been a practicing vascular surgeon since 2006. Dr. Tonnessen is board certified in general and vascular surgery, and is a Fellow of the American College of Surgeons. 

    Dr. Tonnessen has expertise in both open surgery and minimally invasive "endovascular" procedures for treating vascular disease. Dr. Tonnessen is also the co-author of the 5th and 6th editions of The Handbook of Patient Care Vascular Diseases, a popular "pocket" book for students and residents.