Michael R. Hamblin, PhD, is a principal investigator in the Wellman Center for Photomedicine at Massachusetts General Hospital, an associate professor of dermatology at Harvard Medical School, and a member of the affiliated faculty of the Harvard-MIT Division of Health Science and Technology. A SPIE Fellow, he is an associate editor for seven journals, serves on the NIH Study Sections, and holds eight patents. Dr. Hamblin has published over 190 peer-reviewed articles, over 150 conference proceedings, and numerous book chapters. His research in photomedicine concentrates on photodynamic therapy for infections, cancer, and heart disease as well as low-level light therapy for wound healing, arthritis, traumatic brain injury, and hair regrowth. Ying-Ying Huang, MD, is an instructor at Harvard Medical School. Dr. Huang has published 40 peer-reviewed articles, 15 conference proceedings, and several book chapters. Her research focuses on photodynamic therapy for infections and cancer as well as the mechanisms of low-level light therapy.