Ming-Chang Liu joined DTM as a postdoctoral associate this month, following the receipt of his Ph.D. in cosmochemistry from UCLA. For his thesis, Liu used secondary ion mass spectrometry (SIMS) to study short-lived radionuclides and stable isotope anomalies in meteoritic refractory inclusions, in order to improve our understanding of the chronology, chemical evolution, and irradiation processes in the early solar system. At DTM, Liu plans to begin a study of the chemical evolution of oxygen and Si and Ti isotopes in the galaxy from the perspective of presolar materials. He will also continue his research on isotope anomalies in refractory solids from primitive meteorites to probe the origin of short-lived radionuclides and the nature of the early solar system.