Dr. Tsai received his undergraduate training at the University of California, Los Angeles (B.S., Biochemistry, summa cum laude), followed by combined medical and graduate training at the University of Southern California (M.D., Ph.D., Biochemistry). He completed anatomic and clinical pathology (AP/CP) residency and hematopathology fellowship at Stanford University, receiving board certification in AP/CP and hematopathology. As an instructor, he performed clinical diagnostic duties on the hematopathology service while doing postdoctoral training in the laboratory of Dr. Sean Bendall, with funding from the Damon Runyon Cancer Research Foundation. As a physician and hematopathologist, he seeks to mechanistically dissect myelodysplastic syndromes (MDS) using highly-multiplexed immunophenotyping — mass cytometry / cytometry by time-of-flight (CyTOF) and multiplexed ion beam imaging (MIBI). MDS is an especially complex and heterogeneous disease of abnormal blood cell development with increasing prevalence and few treatments. By combining practical experience clinically diagnosing MDS, next generation single cell proteomic approaches, fundamental discoveries in the biology of MDS, and knowledge of clinical laboratory testing, we hope to develop new clinical diagnostics for personalizing MDS therapies and therapeutic monitoring. His clinical diagnostic duties are on the hematopathology service, primarily in the diagnosis of MDS, leukemias, lymphomas, and other hematopoietic diseases from blood, bone marrow, and tissue samples.

I have been with the Stanford School of Medicine since 2001. I received my MPH in Public Health from UC Berkeley in 2011 and joined The Stanford Center for Population Health Sciences (PHS) in 2016. My research interests focus on social and environmental determinants of health, particularly how the built environment, especially housing and transportation policy promotes equitable access to the economy, education and other opportunities. I am the Associate Director of the Data Core at PHS. The PHS Data Core specializes in hosting large, rich, high risk data which are used by hundreds of researchers to answer questions in precision and population health. My primary responsibilities include overseeing governance and regulatory matters, data security, privacy and ethics and collaboration with the team of research scientists and engineers who have built the PHS Data Core platform. This platform and model have been replicated in several universities throughout the United States. Prior to joining PHS I initiated the Stanford Research Registry (SRR) which grew to over 4,000 members within two years and greatly facilitated research participation for both individuals with chronic disease as well as healthy controls in clinical trials and qualitative research. The SRR served as the foundation for the Patient Engagement Portal initiative which allows for bi-directional communication with the entire Stanford patient population and the general public for the purposes of recruitment for research, reporting research findings and allowing research participants to better understand the impacts of their service on the advancement of science.

Stanford Advancing Health Equity and Diversity (AHEaD) ahead.stanford.edu Founding Co-Director (2020-present) Veterans Aging Cohort Study (VACS) Executive Director (2022-present) Cancer Core Co-Director (2016-present) International Workshop on HIV and Hepatitis Observational Databases (IWHOD) iwhod.org Chair, Scientific Secretariat (2024-present) Dr. Lesley Park is a co-founding director of the Stanford AHEaD summer research program for college students from underrepresented and historically excluded groups in the health sciences. She is also the Executive Director of the VACS consortium, an international collaboration of methodologists, clinicians, and trainees who utilize the rich and valuable data from the Veterans Health Administration to do impactful research. VACS has been at the forefront of research to understand aging with HIV to improve patient care, particularly with respect to alcohol and other substance use, physiologic frailty, and polypharmacy. In recent years, the VACS mission has expanded to encompass other foci, including genomic research and most recently COVID-19. Within the VACS, Dr. Park oversees cancer and COVID-19 outcomes research in persons with HIV/AIDS (PWH). Her research experience has focused on the intersection of cancer and HIV, examining epidemiologic methods for cancer research, cancer incidence trends, and cancer (particularly hepatocellular carcinoma) prevention in PWH. Dr. Park is an experienced epidemiologist, skilled in "big data" observational research, survival analysis, and SAS programming. She teaches courses in computing, data management, and epidemiologic analysis methods. Her prior experience includes research at the Yale School of Medicine and at the Center for Biostatistics in AIDS Research (CBAR) at the Harvard School of Public Health. The International Workshop on HIV and Hepatitis Observational Databases (IWHOD) is an established scientific forum for the appropriate application of real-world data to emerging issues in infectious disease. Dr. Park leads the IWHOD scientific committee of internationally reknowned experts in infectious disease and is responsible for administrative and scientific coordination of IWHOD. Previously, Dr. Park was one of the leaders of the Stanford Center for Population Health Sciences (PHS). PHS aims to improve the health of populations by bringing together diverse disciplines and data to understand and address social, environmental, behavioral, and biological factors. She oversaw all of the educational and training initiatives at PHS and was one of the founding directors of the PHS Data Center and PHS Postdoctoral Fellowship program.