Following undergraduate studies at the College of William and Mary, Dr. Lewis conducted research at the National Biomedical Research Foundation of Georgetown University. Thereafter, Dr. Lewis earned his PhD in Molecular and Cellular Biology at the University of California, Santa Cruz, followed by postdoctoral training in mammary gland development and breast cancer at the University of California, Santa Cruz and the University of Colorado Health Sciences Center. His work focuses on the genetic regulation of mammary gland development, normal and malignant mammary stem and progenitor cell regulation, and mechanisms of treatment resistance in breast cancer.