Christine J. Ko is a Professor of Dermatology and Pathology at Yale University School of Medicine. She trained in dermatology at University of California, Irvine, where she was strongly influenced by Dr. Barr. She subsequently completed a fellowship in dermatopathology under Dr. Scott Binder at University of California, Los Angeles. She lectures nationally and internationally; and has published numerous book chapters, journal articles, and five textbooks/atlases in the fields of dermatology and dermatopathology. Ronald J. Barr is Professor Emeritus of Dermatology and Pathology at the University of California, Irvine. He is a nationally and internationally recognized dermatopathologist with board certification in dermatology, anatomic pathology, and dermatopathology. He received the Founders” Award from the American Society of Dermatopathology for his myriad contributions to the field of dermatopathology and the Society”s Walter Nickel Award for excellence in teaching dermatopathology. He has authored over 150 original articles and book chapters. He is also past president of the American Society of Dermatopathology and past president of the American Board of Dermatology.