Derek J. Lomas, M.D., Pharm.D., is a senior associate consultant in the Department of Urology at Mayo Clinic, Rochester, Minnesota. Dr. Lomas underwent his residency and fellowship training at Mayo Clinic, Rochester, and served as a Mayo Clinic Scholar at University College London and Imperial College in London in the fields of Imaging, Targeted Biopsy, and Focal Therapy of Prostate Cancer.