Piergiacomo Calzavara-Pinton attended the Medical School in Milan, Italy, and completed his clinical Dermatology training at the Department of Dermatology I at the University of Milan. Since 1984 he has been a member of staff in the Department of Dermatology at the Spedali Civili of Brescia and, since 1998, has been the head of the Photobiology and Phototherapy Unit. His main fields of clinical research are phototherapy, photochemotherapy, photodynamic therapy and connective tissue diseases. He is also involved in clinical and experimental trials for the development of new "second generation" photosensitisers for photodynamic therapy.Rolf-Markus Szeimies studied at the University of Munich, Germany, finishing with a doctoral thesis in 1989. From 1989 to 1991 he was a resident physician at the Department of Dermatology at the University of Munich. Since 1991 he has been at the Department of Dermatology of the University of Regensburg where he now holds the position of Assistant Professor. Apart from Photodermatology, his research interests include Photodynamic Therapy, Oncology and Laser Therapy.Bernhard Ortel is a native of Vienna, Austria, where he went to Medical School and completed his clinical training in Dermatology at the Department of Dermatology I. Early on during his residency his interest focused on photosensitivity diseases and phototherapies. During his training and his time as fulltime staff and Dozent at the Division of Special and Environmental Dermatology at the University of Vienna he pursued both the clinical and basic research sides of photosensitization. In 1994 he assumed a position at the Wellman Laboratories of Photomedicine at Massachusetts General Hospital in Boston, where he spends most of his time investigating photodynamic therapy using aminolevulinic acid-induced porphyrins. He currently holds the position of Assistant Professor of Dermatology at Harvard Medical School.