People

Han Li, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine. She attends on direct care and medicine resident teaching services at Barnes Jewish Hospital, Barnes West County, and The Rehab Institute of St. Louis. Her academic interests are in medical education, quality improvement, clinical decision support and user design. She serves as a Deputy Editor at UpToDate, a continuously updated resource providing evidence-based and actionable recommendations guiding clinicians at the point of care.

She previously served as the Director of Quality Improvement and Patient Safety for the Division of Hospital Medicine. Previous work has included creation of the WashU COVID Care Manual, implementation of a sepsis detection alert, and improvement of antibiotic delivery to patients with septic shock.

Michael Lin, MD, SFHM, is an Associate Professor of Medicine and Senior Fellow of Hospital Medicine. His interests include teaching and education, process improvement, and utilization management. He serves on the Internal medicine residency program evaluation committee, the Department of Medicine’s operations executive council, and multiple other committees for both Washington University and BJC Healthcare.  He serves on the Society of Hospital Medicine Annual Conference Committee and a member of the Executive Council of the Society of Hospital Medicine Interhospital Transfer Special Interest Group. He chaired two Society of Hospital Medicine’s Academic Hospitalist Leadership Summits and served on the Society of Hospital Medicine’s Academic committee. He is president-elect of the Barnes Jewish Hospital Medical Staff Association. He serves as a physician advisor for Barnes-Jewish Hospital. He is the medical director of the BJC Healthcare system transfer center covering 11 hospitals across the system.

Patricia Litkowski, MD, is an Assistant Professor of Medicine and the Medical Director of Patient Experience at Barnes-Jewish Hospital. She also serves as the Director of Hospitalist Services for Inpatient Medical Oncology. She has interest in the care of hospitalized patients with cancer, interprofessional communication and teamwork, and improving the overall experience that patients have while receiving care in the hospital. Her research interests include reducing readmissions and improving length of stay.

Adam Littich, MD is an Associate Professor of Medicine and the Medical Director of the Hospitalist Service at Barnes-Jewish West County Hospital (BJWCH).  He is the Chief of Staff at BJWCH until 2026, where he represents the entire medical staff and serves as a liaison between the hospital and the physicians and other providers.  He is active in leadership at BJWCH, being involved in all aspects of the delivery of inpatient care.  He is a member of multiple committees and has a strong interest in quality improvement and high value inpatient care.  In addition to his leadership roles, he continues to enjoy direct patient care as a full-time hospitalist at BJWCH.  Dr. Littich also educates future physicians via the medicine teaching services (FIRM Medicine, Procedure Team) at Barnes-Jewish Hospital.  He has been a member of the Division of Hospital Medicine since 2012.

Sonya Liu, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine and enjoys working on a variety of different inpatient hospitalist services including general hospitalist service, medicine firm teaching service, nocturnist/admitter, ED hospitalist, oncology/BMT service, Barnes West County, and medical consultation services at TRISL. She used to serve on the Washington University School of Medicine Committee on Admissions to review and rate applications as part of the medical student admissions process. Currently, she serves on the hospitalist Patient Care Operations committee as well as the hospitalist orientation committee. Her areas of interest include teaching medical students and residents, antimicrobial stewardship, and optimizing transitions of care (for example, medication reconciliation on admission and discharge).

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.