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Internationally recognized researcher Duojia (DJ) Pan, Ph.D., joined UT Southwestern Medical Center in June 2016 as Chair of the Department of Physiology. Dr. Pan discovered the ā€œHippoā€ pathway of intracellular signaling that controls organ size in animals. Deviations in Hippo signaling give rise to cellular hyperplasia, which leads to hippopotamus-sized organs. Dr. Pan was a member of the Physiology faculty at UT Southwestern from 1997 to 2004. From 2004 until 2016, he was on the faculty at Johns Hopkins University School of Medicine, where he most recently was Professor of Molecular Biology and Genetics. While at Johns Hopkins, he became a Howard Hughes Medical Institute investigator. He earned his undergraduate degree from Peking University, his Ph.D. from the University of California, Los Angeles, and completed postdoctoral studies at University of California, Berkeley.