Margaret L. McNairy, MD, MSc
David C. and Betty Farrell Professor of Medicine, Chief – Division of General Medicine & Geriatrics, and Chief – Division of Hospital Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
- Email: mcnairy@nospam.wustl.edu
Michael Lin, MD, SFHM
Section Chief of Hospital Medicine, Associate Professor of Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Thomas Hoyt, MD
Assistant Professor of Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
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, AGACNP-BC
Nurse Practitioner
- Phone: 314-362-1700
- Fax: 314-362-9878
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. She also serves on the Division of Hospital Medicine’s EMR Committee to improve EMR workflow and streamline provider level improvements.
Alvin Jeon, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
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.
Eric Johnson, MD
Associate Professor of Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Eric K. Johnson, MD, is an Associate 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.
Anand Kadakia, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Dr. Anand Kadakia joined the Division of Hospital Medicine as an Instructor in Medicine in July 2024. He completed his medical education at the Government Medical College of Baroda in India. Dr. Kadakia actively engaged in community service initiatives, particularly focusing on assisting patients with sickle cell disease. He conducted research at the University of Maryland School of Medicine, investigating the role of NAD in diabetic neuropathy. Dr. Kadakia completed his Internal Medicine residency at Jersey Shore University Medical Center in New Jersey, where he prioritized serving underserved populations and leading quality improvement projects.
Lalit Kalvala, MD
Assistant Professor of Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Lalit Kalvala, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine. He primarily works on general medicine floors and occasionally on oncology and bone marrow transplant floors. He contributes to the recruitment of hospitalists by serving as a member of the Hospitalist Recruitment Committee. Additionally, he is dedicated to patient safety and quality improvement, participating as a member of the Patient Safety & Quality Improvement Committee.
Syeda Ashna Fatima Kamal, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Syeda Ashna Fatima Kamal, MD, is an Instructor in Medicine in the Division of Hospital Medicine. Kamal was born in Karachi, Pakistan, and spent much of her formative years in Dubai, United Arab Emirates, where she completed her middle school, high school, and college education. She earned her medical degree from Dow International Medical College in Pakistan, graduating in 2018. Her postgraduate training began with an internal medicine residency internship at Lincoln Medical Center in Bronx, New York. She then continued her internal medicine residency as a PGY-2 and PGY-3 at Southern Illinois University in Springfield, Illinois, where she graduated in 2024. Following her residency, she pursued a palliative care fellowship at Saint Louis University, completing it in 2025. Kamal is committed to providing exceptional patient care, contributing to medical education, and continuing her involvement in clinical research, particularly in the realm of oncology and hematology.
Ankita Kapoor, MD, MBBS
Assistant Professor of Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Ankita Kapoor, MD, MBBS, joined the Division of Hospital Medicine as an Assistant Professor of Medicine in October 2022. She provides direct care to patients admitted on the Hospitalist Service at BJH as well as BJWCH. She serves as the Director of the Advanced Practice Clinician (APC) Workforce Development, in the Division of Hospital Medicine. She enjoys teaching residents and medical students along with the PA students. She has assisted with curating an APC educational Curriculum and a robust APC evaluation process. She is also the Director of the Hospital Medicine Fellowship Program for APCs at BJH. Dr. Kapoor serves on several committees within the Division, such as Physician and APC Recruitment, Quality Improvement & Patient Safety as well as Orientation. She is also involved in the WashU Gateway Medical Conference Task Force. She also aids in interviewing and recruiting medical students for the IM Residency Program. Her current areas of interest are general internal medicine, particularly hospital medicine and inpatient services.
Gizem Kaya, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Dr. Kaya joined the Division of Hospital Medicine as an Instructor in Medicine in July 2024. She was accepted to one of the top third medical schools in Turkey after being part of the 0.1 percentile of students in the national exam of Turkey. During medical school, she participated in multiple community service projects with the Rotary International Organization in Turkey, including blood donation projects to raise awareness and mental/mood supporting projects for children in Pediatric Hematology and Oncology hospitals. After completing medical school, she started to work as a research fellow in Cleveland Clinic Digestive Disease and Surgery Institute in Cleveland, Ohio, by 2020. She participated in multiple research projects during her time at the Cleveland Clinic about inflammatory bowel diseases and advanced endoscopic procedures, including endoscopic mucosal resection and endoscopic submucosal dissection. She completed her Internal Medicine training at the University of Pittsburgh Medical Center in Central Pennsylvania prior to joining the division.
Martin Kerrigan, MD
Associate Professor of Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Martin Kerrigan, MD, is an Associate Professor of Medicine and serves as a Co-Director of the Internal Medicine Service in the Division of Hospital Medicine. Dr. Kerrigan also serves as the Internal Medicine Associate Clerkship Director for the School of Medicine and works as a Physician Utilization Management Advisor for Barnes-Jewish Hospital. His clinical interests include medical consultation, medical student education, curriculum development, and providing high value clinical care. He attends on the inpatient general medicine teaching service (Firm), on the medicine consult service, and on the hospitalist direct care service.
Amani Khalouf, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Amani Khalouf, MD, joined the Department of Medicine in the Division of Hospital Medicine as an Instructor in October 2025. She was born and raised in Damascus, Syria before moving to the United Arab Emirates in 2013 to pursue her medical degree in Medicine and Surgery in University of Sharjah, UAE, while simultaneously working on basic cellular research in modifying biological pathways involved in Obesity. Dr. Khalouf graduated with Bachelor of Medicine and Surgery in 2019 and joined Cleveland Clinic Abu Dhabi for Emergency Medicine Residency. During her residency, she served in acute stepdown units of COVID 19 patients during the COVID 19 outbreak. Meanwhile, Dr. Khalouf cultivated her interest in Cardiac Critical Care and was involved in multiple research projects including COVID 19 patients and Cardiac patients. She then moved to the USA for further training and completed her Internal Medicine Residency training in Rochester General Hospital, NY in 2025. She has special interest in autonomic dysfunction groups and POTS patients.
Ali Khan, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Dr. Ali Ayub Khan joined the Division of Hospital Medicine as an Instructor in Medicine in July 2024. He grew up in Oklahoma City, Oklahoma, before attending the University of Oklahoma for undergraduate studies. He graduated magna cum laude with a bachelor’s degree in biochemistry with a minor in Spanish while also completing the Interdisciplinary Honors Program. He dedicated much of his time during undergrad to the service of his community, specifically the underserved and uninsured Hispanic populations, through volunteer work at free medical clinics. He continued his studies at the University of Oklahoma and obtained a master’s degree in science in the field of prevention sciences and addiction. He went on to receive his medical degree from the University of Oklahoma—Tulsa School of Community Medicine. Dr. Khan then completed his internship and residency training in Internal Medicine at the Saint Louis University School of Medicine in St. Louis, Missouri. His training at this large university center and safety net hospital further reinforced the importance of socioeconomic factors on population health and health disparities.
Hazera Khatun, MD
Instructor in Medicine
- Phone: 314-362-1700
- Fax: 314-362-9878
Dr. Hazera Khatun joined the Division of Hospital Medicine as an Instructor in Medicine in July 2024. She earned her MBBS degree from Dhaka Medical College in Bangladesh and completed her hematology training, receiving a fellowship from BCPS. Dr. Khatun has published multiple articles in clinical research on hematology. She obtained an MSc in Biomedical Sciences from King’s College London, UK, as a Commonwealth Scholar. In the USA, she completed her residency in Internal Medicine and has been practicing as a full-time hospitalist since 2019. Dr. Khatun also has a keen interest in clinical education and briefly taught as a Clinical Assistant Professor at the Warren Alpert School of Medicine.