The Lancaster Skin Center, PC was founded in 1997 by William Andersen, MD. Dr. Andersen graduated cum laude from Harvard College in 1983 with a degree in biochemistry. He then attended the Columbia College of Physicians and Surgeons and received his MD there in 1987. He stayed at Columbia Presbyterian Hospital for a residency in anatomic pathology and thereafter became a board certified pathologist. Dr. Andersen developed an interest in diseases of the skin while a pathologist and then performed a second residency in dermatology at the Boston University-Tufts training program, which he completed in 1994. He was elected to the highly selective Alpha Omega Alpha honor society during his residency. He then performed a fellowship in dermatopathology at Boston University and became an Assistant Professor of Dermatology, Pathology, and Laboratory Medicine at Boston University Medical Center. Dr. Andersen is triple board certified in dermatology, anatomic pathology, and dermatopathology, and has published numerous articles in scholarly medical journals regarding his research in dermatopathology and dermatology.