Program Faculty

Michael Moulton, MD
Professor, Department of Surgery
Chief Cardiothoracic Surgery

Dr. Moulton attended Harvard Medical School and completed his residency in general surgery and cardiothoracic surgery and a surgery research fellowship at Washington University. He is board certified in both surgery and thoracic surgery. He is currently the Chief of Cardiothoracic Surgery at UNMC and his subspecialty is lung transplantation and valve repair.

Michael Moulton, MD, FACS

Rudy Lackner, MD
Professor, Department of Surgery
Program Director, Cardiothoracic Surgery Fellowship Program
Vice Chief, Cardiothoracic Surgery
Chief, Section of Thoracic Surgery
 

Dr. Lackner completed his medical degree at New York Medical College and his residency at Long Island Jewish Medical Center, Long Island, NY. He completed fellowships in cardiothoracic surgery at the University of Chicago and in heart and lung transplant at the University of North Carolina, Chapel Hill. He is currently the Chief of the section of Thoracic Surgery and the Director of the Comprehensive Thoracic Oncology Program at the University of Nebraska Medical Center and currently serves as the Nebraska Chair, American College of Surgeons Commission on Cancer Physician Liaison Program. He has a special interest in the combined use of surgery, chemotherapy and radiation to treat advanced stages of cancer. He is very interested in the use of minimally invasive procedures in the treatment of these cancers.

Rudy P. Lackner, MD

Anthony Castleberry, MD, MMCi
Assistant Professor, Department of Surgery
Cardiac Surgery

Dr. Castleberry completed his medical degree at the University of Pittsburgh School of Medicine, Pittsburgh, PA, his general surgery and cardiothoracic surgery residencies (respectively) and advanced fellowship in Cardiac Transplantation and Aortic Surgery at Duke University, Durham, NC.  He is board certified in general and cardiothoracic surgery. Dr. Castleberry has industry experience in advanced data analytics, and his research interest include utilizing large-scale databases and informatics to develop innovative clinical and health services research focused on outcomes, quality, efficiency, and cost in the care of surgical patients and as part of broader healthcare systems.

 

Anthony Castleberry, MD, MMCi, CardiacSurgery 2019

John Um, MD, FACS
Associate Professor, Department of Surgery
Surgical Director of Cardiac Transplant & Mechanical Circulatory Support Program

Dr. Um is a graduate from Brown University School of Medicine, Providence, Rhode Island. He completed his residency in General Surgery at the University of Medicine and Dentistry New Jersey in New Brunswick, NJ. He completed his Cardiothoracic Surgery residency at the University of California San Francisco, CA. Dr. Um also completed a fellowship in Thoracic Transplantation and Mechanical Assist Devices at Duke University School of Medicine in Durham, NC. He is board certified in general and thoracic surgery and practices adult cardiac surgery at UNMC. His interests are heart transplantation, mechanical circulatory support, surgical therapies for heart failure, and coronary and valvular heart disease. He is an assistant professor in the division of Cardiothoracic Surgery.

John Um, MD, FACS

Aleem Siddique, MBBS, FACS
Associate Professor, Department of Surgery
Surgical Director, Aortic and Lung Transplantation Programs
Cardiovascular & Thoracic Surgery

Aleem Siddique attended medical school at the Aga Khan University Medical College in Pakistan. He spent two years in the laboratory of Dr. Richard Hodin at Massachusetts General Hospital/Harvard Medical School. He subsequently completed residencies in general surgery at the University of Texas Southwestern Medical Center in Dallas, and in cardiothoracic surgery at the University of Arizona. Advanced training was in cardiopulmonary transplantation and mechanical circulatory support at Freeman Hospital, NUTH NHS Foundation Trust, UK. In addition to general cardiothoracic surgery he has a particular interest in the surgical treatments of end-stage lung disease, especially lung transplantation and aortic surgery. He has joined UNMC to continue their strong tradition in solid organ transplantation with a program in lung transplantation.

Aleem Siddique, MD

Karin Trujillo, MD
Associate Professor, Department of Surgery
Cardiovascular & Thoracic Surgery
Service Line Director, Thoracic Oncology
Associate Program Director, Cardiothoracic Surgery Fellowship Program

Dr. Trujillo received her medical degree from New York University School of Medicine, New York, NY and completed her general surgery residency from North Shore University Hospital. She is fellowship trained in Thoracic Oncology and Cardiothoracic Surgery from NYU Medical Center, New York, NY. She is board certified in both General and Thoracic Surgery. Dr. Trujillo serves as the Chief of Thoracic Surgery at the VA Medical Center, Omaha, NE. She serves on many committees at UNMC, is active in resident instruction and mentoring, and is a member of numerous professional societies.

Karin Trujiollo, MD

David B. Berkheim, MD
Assistant Professor, Department of Surgery
Cardiovascular & Thoracic Surgery

Dr. Berkheim received his medical degree from the University of Nebraska Medical Center, Omaha, NE. He completed his general surgery residency from Christiana Care Health Systems, Newark, Delaware and his thoracic surgery residency from UNMC. He is board certified in general surgery. Dr. Berkheim's research and professional interests include, thoracic surgery, thoracic oncology, lung cancer screening, esophageal cancer and advanced stage lung cancer treatments. He is a member of the American College of Surgeons, the Society of Thoracic Surgery and the Nebraska Medical Association.

David B. Berkheim, MD

Kim Duncan, MD, FACS
Professor, Cardiothoracic Surgery
Surgery of Congenital Heart Defects
University of Nebraska Medical Center and Children's Hospital and Medical Center

Dr. Duncan attended medical school at the University of Alberta in Canada and completed his General Surgery residency and a Master of Science in Experimental Surgery at the same institution.  A residency in Cardiothoracic Surgery was completed at the University of Alberta Hospitals followed by fellowships in congenital heart surgery at Sick Kids in Toronto and the Hospital for Sick Children, Great Ormond Street in London, UK.  Dr. Duncan was an assistant professor in CT Surgery at the University of Manitoba Health Sciences Center in Winnipeg, Canada, before coming to UNMC and Children’s Hospital in 1993.  Currently he is a Professor in the Division of Cardiothoracic Surgery and Vice Chair for Compliance and Outcomes in the Department of Surgery.  Dr. Duncan participates in the CT Surgery and General Surgery residency programs at UNMC, including  cardiac surgical simulation, and is the local Surgeon Champion for the American College of Surgeons National Surgical Quality Improvement Program.

Kim Duncan, MD, FACS

Marian Urban, MD, PhD
Assistant Professor, Department of Surgery
Cardiothoraic Surgery

Dr. Urban completed his medical and post-doctoral degrees from Charles University in Prague, Czech Republic, his general surgery residency at University Hospital, Zilina, Slovakia, colorectal surgery residency at Singleton Hospital, Swansea, UK and heart and lung transplantation cardiothoracic surgery fellowship at Freeman Hospital, Newcastle, UK, Institute for Clinical, Experimental Medicine, Prague, Czech Republic and University Hospital of Wales, Cardiff, UK.  His PhD related research focused on Alloimmunosensitiztion of Patients Supported with Durable LVADs and Impact on Post-transplantation Outcome. Dr. Urban joined UNMC November 2017. His areas of special interest include; heart/lung transplantation and mechanical circulatory support and has published more than 30 articles in peer-reviewed journals. He is a member of the Society of Thoracic Surgery, the European Association of Cardio Thoracic Surgery and the International Society for Heart and Lung Transplantation and serves on many professional committees. He is the recipient of the ISHLT Travelling Fellowship Award (2015, Salt Lake City, UT) and the ISHLT Registry Early Career Award 2016.  In his spare time Dr. Urban enjoys traveling and reading (mainly historical fiction).

 Marian Urban MD, Ph.D

James Hammel, MD, FACS
William H. Fleming, MD Endowed Chair in Pediatric Cardiothoracic Surgery
Clinical Service Chief, Cardiac Surgery, Children's Hospital & Medical Center
Associate Professor, Department of Surgery, University of Nebraska Medical Center

Dr. Hammel is a graduate of the University of Michigan Medical School, Ann Arbor. He completed his residency in General Surgery at the University of Nebraska Medical Center (UNMC) and a Cardiothoracic Surgery residency at the University of Iowa Hospitals and Clinics, Iowa City; after which he completed a fellowship in Congenital Cardiac Surgery at the Hospital for Sick Children, Toronto, Ontario, Canada.  He also accomplished research fellowships in Neonatal Cardiac Surgery and Transplant Surgery.  Dr. Hammel practices pediatric cardiothoracic surgery at Children’s Hospital & Medical Center and the Nebraska Medical Center.  He is Board certified in General Surgery, Thoracic Surgery, and Congenital Heart Surgery with the American Board of Thoracic Surgeons.  He is an Associate Professor of Surgery in the Division of Cardiothoracic Surgery at UNMC and is Clinical Service Chief in Cardiothoracic Surgery at Children’s Hospital & Medical Center.

Hammel.jpg

Ali Ibrahimiye, MD
Pediatric Cardiac Surgery, Children's Hospital & Medical Center
Assistant Professor, Department of Surgery
Cardiovascular & Thoracic Surgery, University of Nebraska Medical Center

Dr. Ibrahimiye is a graduate of Duke University where he majored in biology and german literature. After Duke, he moved to New York and received his MD from Columbia University College of Physicians and Surgeons.

He completed the general surgery and cardiothoracic surgery residency programs at Columbia University Medical Center. He briefly moved to Northern California, where he did a two year congenital cardiac surgery fellowship under the supervision of Dr. Frank Hanley. He joined UNMC and Children’s Hospital Medical Center in July of 2016. Dr. Ibrahimiye is board certified in Surgery and Thoracic Surgery. He was been listed as one of the top surgeons in America and received companionate physicians and patients choice awards from Vitals.com
He lives in Omaha with his wife and two sons and is an avid tennis player and skier.  

Ali Ibrahimiye, MD