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Meet Our Team

Dr. Federico M. Asch

Federico M. Asch, MD

Federico M. Asch, MD, FACC, FASE, is the Director of the Cardiovascular Core Lab, Director of Cardiac Imaging Research, Assistant Professor of Medicine (Cardiology) at Georgetown University and a member of the faculty at the Medstar Heart and Vascular Institute at MedStar Washington Hospital Center. He is vice-chair of the IRB at MedStar Health Research Institute/MedStar Washington Hospital Center.

Dr. Asch is active in different national organizations. He is Chair of the Guidelines and Standards Committee, a member of the Scientific Sessions planning, a member of the IT Task Force for the American Society of Echocardiography, and a member of the Digital Steering Committee of the American College of Cardiology. He is a member of review boards for the NHLBI including the SMARTT program and participates as peer reviewer for multiple medical journals such as JAMA, Annals of Internal Medicine, JACC, Circulation, JASE, EHJCVI and others. Among other studies, Dr Asch is Principal Investigator for GenTAC, a multicenter national registry of patients with genetically-related thoracic aortic aneurysms and related cardiac conditions and chairs the Imaging Subcommittee for this study.

Dr. Asch is a frequent invited speaker at national meetings and is board certified in cardiology. His areas of interest are pathologies of the aorta, myocardial viability, critical care cardiology, 3-D echocardiography, contrast echocardiography, and valvular heart disease. Dr. Asch has published several articles in peer-reviewed journals including the New England Journal of Medicine, Circulation, JACC and the American Heart Journal. He received his Medical Degree from the Universidad de Buenos Aires Medical School and completed a Cardiology Fellowship at Instituto Cardiovascular de Buenos Aires in Argentina. He then completed an Echocardiography fellowship, followed by a residency and fellowship in Cardiovascular Disease at the Georgetown University/MedStar Washington Hospital Center, D.C., VA Medical Center program.
Dr. Neil J. Weissman

Neil J. Weissman, MD

Neil J. Weissman, MD, FACC, FASE, is the Chief Scientific Officer for MedStar Health and president of MedStar Health Research Institute. As chief scientific officer, he provides leadership for the development and implementation of specific scientific priorities, with a commitment to further advancing MedStar Health as an academic healthcare system. As president of the Research Institute, he is responsible for the overall strategic and operational direction of the research arm of MedStar Health.

Dr. Weissman is a professor of medicine at Georgetown University School of Medicine and an internationally recognized expert in cardiovascular imaging in clinical trials. He founded the Cardiovascular Core Laboratories at MedStar Washington Hospital that has provided services for hundreds of multi-center trials, including multiple studies on the effects of medications on valvular and ventricular function, novel prosthetic valve assessments, and intracoronary therapies.

Specifically, Dr. Weissman’s research interests include the use of cardiovascular ultrasound imaging in clinical trials. He has served as principal investigator for numerous national and international multi-center trials and was the national principal investigator on several cardiac safety studies, including one that involved more than 7,000 participants. More recently, he has been working on artificial intelligence and machine learning with cardiac imaging. Prior to his current roles, Dr. Weissman served as the director of the Clinical Echocardiography Laboratory at MedStar Georgetown University Hospital.

Internationally recognized as an expert in cardiac ultrasound, Dr. Weissman has served on several national organizations, as well as editorial boards for various peer-reviewed journals. He has written hundreds of original reports published in high profile journals, such as the New England Journal of Medicine, Journal of the American Medical Association, Annals of Internal Medicine and Circulation. In addition, he has written review articles, book chapters, and a textbook on cardiac imaging. He is frequently invited to serve as an expert on U.S. Food and Drug Administration advisory panels and National Institutes of Health commissions. Dr. Weissman has held several national leadership roles including past president of the American Society of Echocardiography and past chair of the American College of Cardiology’s Imaging Council. He currently serves on the American Association of American Medical Colleges (AAMC) Advisory Panel on Research.

Dr. Weissman received his medical degree from Cornell University Medical College in New York. He completed his internship, residency and chief residency in Internal Medicine at New York Hospital. He followed his residency training with a clinical and research fellowship in Cardiology and a fellowship in Cardiac Ultrasound at Massachusetts General Hospital in Boston.
Dr. Gaby Weissman

Gaby Weissman, MD

Gaby Weissman, MD, is director of the Medstar Cardiovascular Magnetic Resonance Imaging (MRI) and cardiac computed tomography (CT) Core Laboratory and a cardiologist at MedStar Washington Hospital Center (MWHC). He is the program director for the cardiovascular disease fellowship at Georgetown University/ Washington Hospital Center as well as the co-director of the advanced cardiac imaging fellowship of the Washington Hospital Center/ National Institutes of Health. He also is associate professor of Medicine (Cardiology) and Radiology at Georgetown University School of Medicine.

Dr. Weissman is widely recognized for his expertise in cardiovascular medicine with a particular focus on cardiovascular MRI and computed tomography (CT). Dr. Weissman is a reviewer for multiple journals including Cardiovascular Revascularization Medicine and the Journal of Cardiovascular Computed Tomography and serves as a reviewer for the American College of Cardiology's Scientific Sessions. Dr. Weissman has published more than 20 articles in peer-reviewed journals, such as Circulation, American Journal of Cardiology, and the Journal of the American College of Cardiology Cardiovascular Imaging.

Dr. Weissman is a member of the American Heart Association, the Society of Cardiovascular Magnetic Resonance Imaging, the Society of Cardiovascular Computed Tomography, and is a fellow of the American College of Cardiology. He has served on the council of tomographic imaging for the Society of Atherosclerosis Imaging and Prevention. At MWHC, he serves on the Institutional Review Board. He is board certified in internal medicine as well as cardiovascular disease, and has certifications in nuclear cardiology, adult echocardiography, and cardiovascular CT.

Dr. Weissman earned his medical degree at the University of Texas Medical Branch in Galveston. He completed his internship and residency in Internal Medicine at Yale-New Haven Hospital. Dr. Weissman further pursued his cardiology training at Yale University with a focus on echocardiography and nuclear cardiology. He obtained further specialization in cardiovascular MRI and CT at the Georgetown University/MedStar Washington Hospital Center program.

Dr. Weissman’s research interests include:

  • Cardiac MRI

  • Cardiac CT

  • Structural heart disease

  • Medical education in cardiovascular care



Dr.Petros Okubagzi

Petros Okubagzi, MD

Petros Okubagzi, MD, is the AVP of Clinical Research Operations of MedStar Health Research Institute. He is also the Director of the Cardiovascular Research Program of MedStar Cardiovascular Research Network.

Dr. Okubagzi’s research interests include interventional cardiology and structural heart. He has been involved in numerous multi-center trials including stents, percutaneous valvular repair and replacement.

Dr. Petros Okubagzi is a member of the many health organizations.

Dr. Okubagzi earned his medical degree at the Gondar College of Medical Sciences in Gondar, Ethiopia. He completed his internal medicine training in Addis Ababa University in Ethiopia. He has done cardiac ultrasound research at Nottingham City Hospital in Nottingham, UK.
M. Therese Tupas-Habib

M. Therese Tupas-Habib, RDCS

Therese joined the MedStar Health Research Institute in 2000 and currently serves as the Manager of the Cardiovascular Core Lab. She received her B.S. in Psychology from the University of Santo Tomas in the Philippines and a Graduate Certificate in Public Health from the Johns Hopkins University. She has over 20 years of echo sonography experience in both the clinical and research settings. Therese is a member of the American Society of Echocardiography.

E-mail: [email protected]
Alston Anderson

Alston Anderson, RDCS

Alston is a research echocardiography sonographer in the Echocardiography Core Lab. He received his echocardiography certificate from the Burwin Institute of Winnipeg, Canada. He is registered in adult echocardiography by the American Registry of Diagnostic Medical Sonography (ARDMS).
Devany De Gante Cano

Devany DeGante Cano, AA

Devany is a Research Associate in the Cardiovascular Core Lab. She currently holds an Associate of Liberal Arts, with honors, and is in the process of completing a bachelor’s in Business Administration with a concentration in Communications and Computer Information Systems at Liberty University. She currently oversees all incoming and outgoing core lab imaging films and maintenance of the tracking database, exercising quality control and administrative support in all core functions.
Sameer Desale

Sameer Desale, MS

Sameer Desale is the Biostatistician for the Cardiovascular Core Lab. Sameer received his Master of Science degree in Statistics from the George Washington University in Washington D.C.
T. Nicole Dickerson

T. Nicole Dickerson, BA

Nicole is a Research Assistant in the Cardiovascular Core Lab. She received her B.A in Sociology from Hood College. She is responsible for entering data into several applicable databases, assisting with preparation and collection of data forms for chart review, copying, sorting and dispersing information to the appropriate locations.
Robin Edelberg

Robin Edelberg, RDCS, RVT

Robin is a research echocardiography sonographer in the Echocardiography Core Lab. She received her B.A. in Hearing and Speech Sciences from the University of Maryland prior to earning her Associate of Applied Science, with honors, from Montgomery College in cardiac and vascular sonography. With over 17 years of experience, she has worked in clinical settings, as well as in an educational setting as a lecturer and clinical instructor at Montgomery College. She is registered by the American Registry of Diagnostic Medical Sonography (ARDMS).
Dr. Lin Han

Lin Han, MD, RDCS

Dr. Han is a Research Echocardiograhy Sonographer in the Echocardiography Core Lab. She received her medical degree from the Capital University of Medical Sciences in Beijing, China and a Master of Science from the National University of Singapore. Dr. Han has several years of clinical experience in cardiology and echocardiography, both clinical and research. She has a diverse Echocardiography research background and has published more than ten papers in the field of echocardiography.
Alton Henry

Alton Henry, RDCS

Alton is a research ehocardiography sonographer in the Echocardiography Core Lab. He joined the lab from The Johns Hopkins Adult Echocardiography Lab. He received his Echocardiography Certificate from John Hopkins School of Medical Imaging and is registered in adult echocardiography by the American Registry of Diagnostic Medical Sonography (ARDMS).
Ji Hyun Jin

Ji Hyun Jin, RDCS

Ji Hyun is a research echocardiography sonographer in the Cardiovascular Core Lab. She received her Associate of Applied Science, with honors, from Montgomery College in cardiac and vascular sonography. She is registered in Adult Echocardiography by the American Registry of Diagnostic Medical Sonography (ARDMS).
Samuel Legarreta

Samuel Legarreta, RDCS

Samuel is a research echocardiographer in the Cardiovascular Core Lab. He received his B.A. from the University of Maryland, and his Associate of Applied Science, with honors, from Montgomery College in cardiac sonography. He has had several years of experience in a clinical setting before focusing on research. He is registered in adult echocardiography by the American Registry of Diagnostic Medical Sonography (ARDMS). He is a member of American Society of Echocardiography.
Dr. Rachel Marcus

Rachel Marcus, MD, FACC

Rachel has worked in the Echo Lab at Medstar Washington Hospital Center and then MedStar Union Memorial Hospital for 16 years, and joined the Cardiovascular Core Lab staff in 2015. She graduated from Stanford Medical School, completed a residency in Internal Medicine at Brigham and Women's Hospital and Stanford Hospital, and was a fellow in cardiovascular medicine at Stanford Hospital. She has focused on echocardiography, and has a special interest in Chagas disease and has written papers on this disease.

She is a Fellow of the ACC and the American Society of Echo.

Dr. Vladimir Masati

Vladimir Masati, MD, RDCS

Vladimir Masati is a Research Echocardiography Sonographer in the Cardiovascular Core Lab. He completed his Internal Medicine and Cardiology training at the Mother Teresa University School of Medicine in Tirana, Albania. He received his echocardiography training at The Johns Hopkins Hospital School of Echocardiography and is a registered cardiac sonographer by the American Registry of Diagnostic Medical Sonography (ARDMS). He is a member of American Society of Echocardiography and the European Society of Cardiology.
Maureen L. McNulty

Maureen L. McNulty, RN

Maureen is the Quality Assurance Coordinator for the Cardiovascular Core Lab. Maureen received her B.A. from the College of William and Mary, graduated with honors from the University of Maryland School of Nursing and then went on to receive her master’s in health systems management from George Mason University. She has 7 years of critical care nursing experience and has worked in the research setting since 2002. In addition, Maureen is a Certified Clinical Research Coordinator, as endorsed by the Association of Clinical Research Professionals.
Dr. Tatsuya Miyoshi

Tatsuya Miyoshi, MD, PhD

Tatsuya is a research fellow at the Cardiovascular Core Lab of the Medstar Cardiovascular Research Network at Medstar Washington Hospital Center. He received his medical degree and a Ph.D. in medical science from Kobe University in Japan. He also completed residency and general cardiology fellowship in Japan. His main areas of interest are myocardial strain analysis, 3-dimensional echocardiography, magnetic resonance imaging, and multimodality cardiac imaging in valvular heart disease, various cardiomyopathies, and cardio-oncology. Currently, he is mainly working on World Alliance Societies of Echocardiography (WASE) Normal Values Study.
Kevin Reeves

Kevin Reeves

Kevin is responsible for overseeing and coordinating existing and new information system activities and identifying gaps and improvement initiatives for trial management information system equipment. Kevin received B.S. in Computer Information Systems from Strayer University in Washington D.C.
Fernando Rodriguez-Weisson

Fernando Rodriguez-Weisson, MD

Fernando is the Assistant Manager and CT/MRI Research tech for the Cardiovascular Core Lab. He graduated from medical school at Pontifical Catholic University in Ecuador and earned his ECFMG certificate after passing the medical boards in the US. He has more than 5 year experience with cardiac CT and CMR.
Tamika Samuel

Tamika Samuel, PhD

Tamika joined the Echo Core Lab in 2017 and serves as the Clinical Project Lead. She holds a Ph.D. in Biomedical Sciences from Washington University in St. Louis. Previously, she worked as a research scientist at the University of Maryland and was instrumental in helping to start a small biotech research company as part of the UMD Maryland Technology Enterprise Institute.
Biruk Teklehaymanot

Biruk Teklehaymanot, RDCS

Biruk is a research Echocardiographer in the Cardiovascular Core Lab. He received his B.Sc., with honors, in cardiovascular Sonography from The George Washington University. Biruk has several years of experience in echocardiography, with clinical, educational, and research roles. He is an Adjunct Professor and clinical Faculty of Cardiovascular Ultrasound at Montgomery College. He is registered in adult Echocardiography and Vascular technology by the American Registry of Diagnostic Medical Sonography (ARDMS). He is a member of American Society of Echocardiography (ASE). He is also a certified Basic Life Support and First Aid instructor.
Amir Ali Zohdi

Amir Ali Zohdi, RDCS

Amir is a Research Echocardiograhy Sonographer in the Cardiovascular Core Lab. Amir received his Associate of Applied Science in sonography from Montgomery College. He is registered in Adult Echocardiography by the American Registry of Diagnostic Medical Sonography (ARDMS).