Wilfred Ngwa is the Director of the Global Health Catalyst program at Dana Farber/Harvard Cancer Center and a professor of radiation oncology and faculty medical physicist at Harvard Medical School and the University of Massachusetts. He also currently holds an international guest professorship at the University of Heidelberg, Germany. He has published two books and won a number of awards and prizes, including the 2015 BRIght Futures Prize for innovative new technology designed for use during radiotherapy to kill cancer cells that have spread to other parts of the body. Paul Nguyen MD is the Director of Prostate Brachytherapy, Senior Physician, and Associate Professor of Radiation Oncology at Harvard Medical School.