Robert J. Nordstrom, Ph.D., is the Chief of the Image Guided Intervention Branch, is acting Deputy Associate Director of the Cancer Imaging Program, and serves as the Quantitative Imaging Network Director, all with the National Cancer Institute (NCI), Bethesda, Maryland, USA. He received his degree in Physics from Ohio State University, Columbus, Ohio, USA for his work in experimental and theoretical nonlinear laser spectroscopy and photon echo measurements.