Thomas Rockwell Mackie, PhD, co-founded TomoTherapy Inc. in 1997 and has served as chairman of the Board of Directors since 1999. TomoTherapy Inc. develops, manufactures and markets the TomoTherapy® radiation therapy treatment platform, in use by hospitals and cancer centers worldwide. Dr. Mackie served as president of TomoTherapy from 1997 until 1999. Since 1987, Dr. Mackie has been a professor in the departments of Medical Physics and Human Oncology at the University of Wisconsin, where he established the TomoTherapy research program. In 1992, Dr. Mackie also co-founded Geometrics Corporation (now part of Phillips Medical), which developed a highly successful radiotherapy treatment planning system.