David Tischfield is an Assistant Professor in the Department of Radiology, Division of Nuclear Medicine Imaging and Therapy, at the University of Pennsylvania. Having completed his MD/PhD, diagnostic radiology residency, and nuclear radiology fellowship at the same institution, David has been a valuable member of the PIGI lab since 2017. His contributions include the development of patient-derived xenograft (PDX) models of hepatocellular carcinoma (HCC), the characterization of the tumor immune microenvironment following locoregional therapy, and the use of metabolic imaging to explore metabolic vulnerabilities in HCC for improved diagnostic imaging paradigms.