People

Francis Loh, MD, joined the Division of Hospital Medicine in the Department of Internal Medicine as an Instructor in July of 2025. He was born in Saint Louis and subsequently lived in Japan and New Jersey. He attended Harvard University and graduated with a bachelor’s degree in applied mathematics with a focus on statistics. He returned to Saint Louis and received his medical degree in 2021 from Washington University School of Medicine in St. Louis. Loh completed his internship and residency at Barnes-Jewish Hospital/WashU School of Medicine in 2024. He then joined the Division of Internal Medicine in 2024 as Chief Resident at Barnes-Jewish/WashU School of Medicine where he advocated fiercely for resident workflow, quality of life, and educational improvements and taught residents and medical students clinical reasoning. Loh’s current areas of interest include general internal medicine with focus on medical education, clinical reasoning, and helping those around him rise.

Ningning Ma, 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.  She is a member of the patient care operations committee. Her primary role is direct care of hospitalized patients at Barnes-Jewish Hospital. She has a particular interest in nocturnist medicine and nighttime resident education.

Sarakshi Mahajan, MD, joined the Division of Hospital Medicine in the Department of Internal Medicine as a clinical instructor in July, 2023. She recently completed her fellowship in geriatrics from University of Arkansas Medical Sciences in June, 2023. Her special clinical interests encompass inpatient medicine, with emphasis on patient safety and quality improvement, medical education, geriatric medicine and improvement of elderly care in hospitals, neuro-cognitive disorders, and public health. Her research interests include microbiome and its role in neuro-cognitive impairment, role of artificial intelligence in medicine, improving outcomes in patients with delirium, and identifying and reducing caregiver stress.

Khalid Mahmood, MD, is an Instructor in Medicine in the Division of Hospital Medicine and works primarily on the Oncology and Bone Marrow Transplant service as a hospitalist. His main area of interest is improving the quality of care amongst patients admitted to Oncology/BMT service. He is also involved in clinical research within the realm of oncology, which aids in the management of the complex medical problems of solid organ and leukemia patients. He serves as an active member of the Oncology/BMT committee which mainly focuses on QA/QI projects to further improve this growing niche of hospital medicine.

Robert Mahoney, MD, FACP, SFHM, is an Associate Professor of Medicine at Washington University. He serves as Vice Chief of Clinical Efficiency for the Division of Hospital Medicine and Lead Utilization Management Physician Advisor for Barnes-Jewish Hospital. He chairs the Hospital Medicine division’s Education Committee and Barnes-Jewish Hospital’s Health Information Management committee; he co-chairs the Hospital’s Laboratory Stewardship committee and serves on School of Medicine’s Committee on Admissions. He attends on the direct care and teaching (Firm) services at Barnes-Jewish Hospital and the internal medicine consult service and the bedside procedure service. His expertise includes medical coding and documentation, health information management, medical education, evidence-based medicine, and case management and care progression. He is certified in physician-based coding and has been named Fellow of the American College of Physicians, Senior Fellow of the Society of Hospital Medicine, and a Castle Connolly Top Doctor.

Dr. Hannah Markova joined the Division of Hospital as an Instructor in Medicine in June 2024. She was born and raised here in St. Louis, Missouri. She went on to attend the University of Cincinnati after receiving a scholarship to play Division I tennis. She graduated summa cum laude with university honors in 2016 with a major in biology and a minor in chemistry. Dr. Markova received the Helen Weinberger Prize, awarded to the top three graduating seniors in Phi Beta Kappa by GPA, as well as the Academic All-American award for her achievements as a student-athlete. After college, she completed a year of research focusing on potential biomarkers for glioblastoma in the Saint Louis University Department of Pharmacology and Physiology. Dr. Markova went on to receive her medical degree in 2021 from the University of Missouri. During her time in medical school, she was inducted into the Alpha Omega Alpha Honor Medical Society and served as the Education Chair for her medical school’s Global Health journal club. Dr. Markova completed her internship and residency at Barnes-Jewish Hospital/Washington University School of Medicine in St. Louis prior to joining the division in 2024. Her clinical interests are general inpatient care with a special interest in infectious disease and quality improvement, as well as the clinical education of medical students and residents.

Nathan Martin, MD, is an Associate Professor of Medicine and Senior Fellow in Hospital Medicine (SFHM) with primary focus and interest in the care of hospitalized medical patients.  He completed residency here at WashU/BJH in 2008 and has been on the faculty ever since.  He spends the vast majority of his time taking care of patients either independently as a traditional Hospitalist, or while supervising residents and medical students on the Firm service.  In addition, he spends time providing medical consultations for other services and attends on the Medicine Procedure service performing various procedures including lumbar punctures and paracentesis.  While clinical care is the mainstay of his interest and what he feels is most essential as a Hospitalist, he also co-directs our Medicine Triage Attending (MTA) service.  He co-founded the MTA service in July 2020 and remains a leader in ensuring the service continues to be successful.  The MTA service triages all medicine patients from the ED, from direct admission locations, as well as from outside hospitals – we always try to ensure the right patient is on the right service at the right time.

Cheryl McDonough, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine and attends on a variety of services including the inpatient medicine teaching service and direct care hospitalist service and serves as a medical consultant at the Rehab Institute of St Louis.  She is interested in medical education, particularly in modeling effective and empathetic patient and family communication skills.  She is a member of the Division of Hospital Medicine Patient Safely and Quality Improvement committee and serves as a BJH Case Management Physician Advisor.

Nikita Melnikov, MD joined the Department of Medicine in the Division of Hospital Medicine as a Clinical Instructor in July 2025.Originally from the southern seaside town of Taganrog, Russia, Melnikov moved to Moscow to attend Lomonosov Moscow State University Faculty of Medicine, where he graduated summa cum laude with a Doctor of Medicine degree. While in medical school, Melnikov honed his research skills, contributing to fundamental studies in Pathology, Biophysics, and Oncology. After graduation, he continued to conduct research, provide care to underserved populations, and started tutoring medical students. Melnikov took his passion for medicine, teaching, and community service to Waterbury, CT, where he completed his internal medicine internship and residency at Yale-Waterbury Internal Medicine program 2022-2025.

Priya Menon, MD, is an Instructor in Medicine in the Division of Hospital Medicine and predominantly works in the oncology and bone marrow transplant service as a hospitalist. She has a special interest in immuno-oncology, targeted therapy, and antibiotic stewardship. She is also motivated in teaching the residents and other learners rotating through oncology and BMT service. While here at WashU, she hopes to continue to work on her research and scholarly activities in the field of oncology. Dr. Menon is a member of the BMT and IDEAS committees.

Eric Mittauer, MD, joined the Division of Hospital Medicine in the Department of Internal Medicine as an Instructor in July of 2025. He was born in Honolulu, Hawaii and grew up across the country in Florida, Virginia, Connecticut, and Iowa. He attended college at the University of Iowa, graduating with honors in 2018 with a BS in Human Physiology and a minor in Biology. He attended medical school at Washington University in St. Louis, graduating in 2022. Mittauer completed internship and residency at WashU School of Medicine in St. Louis /Barnes-Jewish Hospital, graduating in 2025. After multiple stages of medical training at WashU/Barnes-Jewish Hospital, Mittauer is thrilled to stay on and join an accomplished group of hospitalists in providing excellence in patient care and medical education.

Dr. Yaman Mkhaimer joined the Division of Hospital Medicine as an Instructor in Medicine in July 2024. He was born and raised in Amman, Jordan, where he received his medical degree at the Hashemite University of Jordan in 2016. In 2020, he moved to Minnesota to join the Mayo Clinic Nephrology and Hypertension Department as a research associate to further his interest in clinical research. Shortly after, he joined the University of Missouri Kansas City, where he completed his Internal Medicine residency prior to joining the division in 2024. Dr. Mkhaimer developed a compelling interest in the cardiology and heart failure fields, immersing himself in research studies with a particular focus on quality and outpatient follow-up improvement. He was even provided the opportunity to present several papers at the American College of Cardiology and the American Heart Association conferences. His present academic interests center around general Internal Medicine, with a specific inclination towards acute cardiovascular care, quality improvement initiatives, and employing multidisciplinary approaches to medical treatment.