Marianna Bei is an Assistant Professor of Surgery at Harvard Medical School and a Principal Investigator within the Center for Engineering in Medicine Surgery at Massachusetts General Hospital and Shriners Hospital for Children-Boston. She manages an independently funded research program focused on understanding cellular and molecular mechanisms that control skin and epithelial appendage formation and homeostasis. A primary focus of her research is to understand whether transcription factors exert their exquisite specificity in vivo through selective, context-dependent, protein-protein interactions and epigenetic regulation, using epithelial appendages as model systems, including the developing tooth.