People

Mark Pinkerton, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine. He joined the division in 2019 after completing his residency at Washington University in St. Louis. He serves as an attending physician on a variety of services including general hospitalist, medical oncology, bone marrow transplant, emergency department hospitalist, nocturnist, and medicine triage. He works at BJH as well as Barnes-Jewish West County. He serves on the recruitment committee for the division. He enjoys teaching medical students and resident physicians in the clinical setting. Areas of interest include care of the hospitalized patient and antibiotic stewardship.

Dr. Thabet Qapaja assumed the role of Instructor in Medicine within the Division of Hospital Medicine in July 2024. Born and raised in Amman, Jordan, he has always been driven by a passion for medicine. He attended the University of Jordan School of Medicine, graduating with honors in 2018. Dr. Qapaja completed his internship and residency at the Cleveland Clinic Main Campus, Cleveland, OH, from 2019 to 2022. Following his residency, he served as a hospitalist and Clinical Assistant Professor of Medicine at the Cleveland Clinic/Cleveland Clinic Lerner College of Medicine (CCLCM) of Case Western Reserve University, Cleveland, OH, from 2022 to 2024 before joining the Department of Internal Medicine at Washington University, St. Louis, in 2024. Throughout his training, he engaged in various interests and participated in numerous research projects. He finds great fulfillment in teaching and collaborating with medical students and residents.

Patricia Quinley, MD, is an Instructor in Medicine in the Division of Hospital Medicine and works primarily as a hospitalist in the Pulmonary Progressive Care Unit where she is the Medical Director. She has been a hospitalist at Barnes Jewish Hospital since 1993 in multiple roles. She currently works with a multidisciplinary team that focuses on patients with prolonged intensive care unit stays who require ongoing medical management as well as intensive rehabilitation in order to successfully transition to home.

Adnan Qureshi, MD, joined the Department of Medicine in the Division of Hospital Medicine as an Instructor in July 2025. Originally from Pakistan, he earned his medical degree on a full scholarship from Nishtar Medical College. Following medical school, he worked extensively as a medical officer in cardiology CCU and ER, providing care to underserved patient populations and managing a diverse range of patients. Additionally, he served as a general practitioner in an urgent care center, providing primary care services to patients with various medical needs. He then spent nearly three years at the University of Louisville researching the impact of HIV and SARS-CoV-2 on cardiovascular complications. After his research work, Qureshi completed his internal medicine residency at St. Barnabas Hospital in Bronx, New York. His current areas of interest are General Internal Medicine with a focus on inpatient care and with a special interest in cardiology.

Dr. Rehan Rais is an Instructor in Medicine at the Division of Hospital Medicine since June 2024. Originally from Karachi, Pakistan, he completed his medical education at Liaquat National Medical College. Dr. Rais completed his residency in anatomic and clinical pathology at Barnes-Jewish Hospital/Washington University School of Medicine, where he also served as a chief resident and participated in recruiting new residents. He further specialized in hepatobiliary and gastrointestinal pathology and is now a board-certified anatomic and clinical pathologist. Driven by his clinical interests, he pursued additional training in Internal Medicine, completing his internship and residency at Barnes-Jewish Hospital/Washington University School of Medicine. He is actively involved in quality improvement projects focusing on heart failure and improving primary care-patient continuity.

Samuel Reuter, PA-C, CAQ-HM, MMS is a Physician Assistant within the Division of Hospital Medicine at Washington University.  He received his Physician Assistant, Master of Medical Science degree from St. Louis University in 2021.  Upon graduating, Samuel completed a fellowship in hospital medicine from the University of Missouri and obtained a Certificate of Added Qualification in Hospital Medicine.  He is passionate about patient care, as well as furthering training and teaching opportunities for physician assistants.

Lois Richard, MD, PhD, is an Associate Professor of Medicine in The Division of Hospital Medicine. She divides her time between the inpatient Hospitalist Service at Barnes Jewish Hospital and the IM Consult Service at The Rehabilitation Institute of St. Louis. She is also a Senior Fellow in the Society of Hospital Medicine. Having established the St. Louis Chapter of SHM in 2010, she continues to be active on the local chapter Advisory Board. Dr. Richard has been Course Chair for “Care of the Hospitalized Patient” CME course since 2007, which now continues as “The Gateway Hospital Medicine Conference.”

Corey Shy, MD, is an Assistant Professor of Medicine at Washington University School of Medicine, committed to patient-centered care, education, and promoting diversity and inclusion within the medical community. Since joining the Division of Hospital Medicine in 2020, he has provided exceptional care to patients with complex medical needs, emphasizing interdisciplinary collaboration to optimize patient outcomes and reduce readmission rates. Dr. Shy is passionate about mentoring residents and medical students, especially in addiction medicine, aiming to bridge educational gaps and equip future physicians with necessary skills. His community service includes advocating for underrepresented minorities in medicine, reactivating the SNMA chapter at Texas A&M, and enhancing minority representation in residency programs. Dr. Shy’s research focuses on improving patient care through innovative approaches, with significant contributions to colorectal cancer screening and addiction medicine.

Kevin Stephenson, MD, is an Assistant Professor of Medicine in the Division of Hospital Medicine. Dr. Stephenson has two career foci: attending on inpatient general medicine teaching services at Barnes-Jewish Hospital and improving the treatment of undernourished children and pregnant women in sub-Saharan Africa. Alongside Mark Manary, Professor of Pediatrics at WUSM, Dr. Stephenson leads a research group that operates clinical trial networks in Sierra Leone, Malawi, and Ghana, across which novel formulations of therapeutic, supplementary, and school foods are tested in the hopes of treating undernutrition and improving physical and cognitive development in vulnerable populations. He had the good fortune of living in Malawi and Sierra Leone for several years; these experiences form the basis of his research career. Most recently, a trial published by Dr. Stephenson’s group was integral in changing the United Nations Codex Alimentarius regulations for the fatty acid content of ready-to-use therapeutic food, after showing that improved fatty acid balance led to superior cognitive development in children with severe acute malnutrition.

Jaclyn Stutz, FNP-BC, is a Nurse Practitioner within the Division of Hospital Medicine. She received her BSN at Bradley University in Peoria, Illinois. She started her nursing career in acute care medicine at BJH in 2011. She went on to receive her MSN at Maryville University. She joined the Division of Hospital Medicine as an NP in 2019. She serves on the Division’s Leadership Team.

Dr. David Tabagari joined the Division of Hospital Medicine as an Instructor in Medicine in July 2024. He was born and raised in Tbilisi, Republic of Georgia, and moved to the United States in 2021 to complete his Internal Medicine residency training. He attended and received his medical degree in 2017 from Tbilisi State Medical University. After graduating, he worked at “Multiprofile Clinic Consilium Medulla” in Tbilisi, Republic of Georgia, as a junior doctor and later as a resident physician in the hematology-oncology program, where he participated in various projects and was working on several major clinical trials. He is currently a co-founder of “Multiprofile Clinic Consilium Medulla” and is using his training and experience to be actively involved in implementing international standards to provide the highest quality medical care for patients in his home country. Dr. Tabagari completed his internship and residency at the University of Missouri School of Medicine in Columbia prior to joining the division in 2024. His current areas of interest are general internal medicine with a focus on inpatient care, with a special interest in hematology and oncology, as well as the detection and management of immunotherapeutic adverse events requiring hospitalization.