People

Madeline Grondalski, MD, is an Instructor in Medicine in the Division of Hospital Medicine and works primarily on the oncology and bone marrow transplant services as a hospitalist. She has an interest in teaching and mentorship of students and residents on the oncology and bone marrow transplant services. She helps with interviewing candidates for the Division of Hospital Medicine as well as aiding in the orientation of new hospitalists. Dr. Grondalski services on the oncology/BMT committee and the orientation committee. Prior to her medical training she completed her nursing education with a Bachelor of Science in Nursing and is a Registered Nurse, which helps strength her interests and patient centered care.  Dr. Grondalski has a special interest in multidisciplinary communication, patient experience, and medical trainee wellness.

Geneva E. Guarin, MD, MBA, is a Clinical Instructor in Medicine. She completed her Internal Medicine residency training at Albert Einstein Medical Center in Philadelphia, Pennsylvania in June 2023. Currently she serves in the BMT/Oncology committee. Her areas of interests include medical education, quality improvement projects, hematology and oncology research, and wellness in hospital medicine. She is passionate about lifelong learning and taking care of patients.

Maria Gurrieri, MD, is a Staff Physician at Barnes-Jewish Hospital and a Voluntary Clinical Instructor in Medicine. She works full time taking care of patients in the Pulmonary Progressive Care Unit, Bone Marrow Transplant service, Hospitalist service, and at PCDC. She serves in the Faculty Development Committee, where she contributed to the development of the “Roads to Success” seminar series for the hospitalist faculty.

Dr. Samantha Harris joined the Division of Hospital Medicine as an Instructor in Medicine in June 2024. She grew up on Long Island, New York, before attending Tufts University in Boston, where she graduated summa cum laude with the highest thesis honors with a bachelor’s degree in biology. After she graduated college, she moved to Madison, Wisconsin, and worked for Epic Systems, where she specialized in operating room software and focused on client leadership engagement and process improvement of surgical patient workflows. This experience at Epic inspired her to learn more about technology and business in health care. She returned to Boston for a joint MD/MBA degree at Harvard Medical School and Harvard Business School, respectively, during which time she also interned at the insurance company Humana, working on a machine learning project to identify trends to improve long-term quality outcomes for patients. Dr. Harris completed her internal medicine internship and residency at the Washington University School of Medicine in St. Louis/Barnes Jewish Hospital in 2021–2024.

Ihab Hassanieh, MD, is an Instructor of Medicine in the Division of Hospital Medicine at the Washington University School of Medicine. He has an interest in teaching and mentorship of students in the hospitalist service and is part of the research committee within the Division of Hospital Medicine. His research interests are in cardiac research and dissemination and implementation of evidence-based interventions. Expanding his expertise, he is currently pursuing dual master’s degrees in business administration and clinical investigation. His bibliography includes significant contributions to cardiology research, with a focus on innovative treatment approaches and clinical outcomes. Dr. Hassanieh’s work embodies a commitment to enhancing healthcare through rigorous research, teaching, and direct patient care.

Krysta Heath, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine.  She completed internal medicine residency at Washington University in St. Louis/Barnes-Jewish Hospital.  Her primary role is direct care of hospitalized patients at both Barnes-Jewish Hospital and Barnes-Jewish West County Hospital.  She has a particular interest in nocturnist medicine.  She serves on the patient care operations committee and has an interest in patient triage and throughput as well as admission efficiency.

Benjamin L. Hoemann, MD is an Instructor in Medicine in the Division of Hospital Medicine. He received his medical degree from the Columbia University Vagelos College of Physicians and Surgeons and completed his internal medicine residency at Washington University in St. Louis. He has a special interest in addiction medicine, point-of-care ultrasound (POCUS), and medical education. He is the inaugural Hospital Medicine Research Fellow and a member of the Quality Improvement and Patient Safety (QIPS) and Research committees within the division. He works as an attending physician on the general medicine and teaching hospitalist services.

Thomas Hoyt, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine with special interests in resident and undergraduate medical education. He currently serves on the Gateway Medicine Clerkship Clinical Competency Committee for Phase 2 Medical Students. Additionally, he is a member of various committees with a focus on improving care for patients with Opioid Use Disorder (OUD). He attends on a variety of services including the General Medicine Inpatient Teaching Service as well as Hospitalist Direct Care at both Barnes-Jewish Main and West County Hospitals.

Carmen Isringhausen, DNP, is an Adult-Gerontology Acute Care nurse practitioner within the Division of Hospital Medicine. She received her Bachelor of Science in Nursing from Southern Illinois University Edwardsville in 2019. Her nursing experience includes acute care medicine and ambulatory care. She went on to receive her Doctor of Nursing Practice from Maryville University in 2023 and joined the Division of Hospital Medicine in 2024.

Alvin Jeon, MD, is an Instructor in Medicine in the Division of Hospital Medicine. He received his medical degree from Jacobs School of Medicine and Biomedical Sciences at the University at Buffalo and completed his internal medicine residency at Barnes-Jewish Hospital/Washington University in St. Louis. He has a growing interest in medical education and efficient inpatient care. He attends primarily on the general inpatient hospitalist and oncology hospitalist services at this time, and he looks forward to working with students and residents.

Joyce Ji, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine with a special interest in education. She attends frequently on the inpatient medicine teaching service in addition to educating students and residents while caring for patients directly on the hospitalist service. She is completing the POCUS Credentialing Pathway in order to improve her utilization of POCUS both in patient care and in trainee education. In addition to student and resident education, Dr. Ji also has a particular interest in faculty education. She serves as the Hospitalist Grand Rounds Chair as part of the Education Committee, and coordinates with experts from different departments and interests to present at the weekly Grand Rounds. She has additional interests in quality improvement and faculty development. As part of the Executive Committee for Advancing Women’s Careers, she is working on promoting transparency and communication within the Department of Medicine in order to improve gender equity.

Eric K. Johnson, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine.  His work responsibilities balance inpatient care on the Hospitalist and Consult services with supervising as attending on both the Firm and Procedure services.  Primary interests include medical student and resident education, particularly guiding and optimizing evidence-based patient care and honing clinical problem-solving skills.  Accordingly, he is a regular discussant at the weekly CPC (Clinicopathologic Conference), which showcases astute medical diagnosis through a multidisciplinary approach, and he has received multiple Teacher of the Year awards to date.  He has also contributed to three consecutive editions of The Washington Manual of Medical Therapeutics.  An additional, albeit more informal passion of his has been following the COVID-19 pandemic since its inception, which has so far yielded several publications in peer-reviewed journals.