A journalist, author, and broadcaster for more than twenty years, David decided early on to merge his passion for science (he majored in physics at Yale) with his love of public radio. He began his career as science reporter for WBUR in Boston and later moved to NPR, where he reported on science, medicine, technology and the environment for "All Things Considered," "Morning Edition," and "Weekend Edition," and served as substitute host of "Talk of the Nation: Science Friday."  David joined "PRI's The World" in 2005 and has overseen several of the show’s major series, including “Cancer's New Battleground - The Developing World,” “School Year,” and “Rationing Health: Who Lives? Who Decides?” David’s work has garnered numerous honors, including the National Academy of Sciences Communication Award, duPont-Columbia Award, Lowell Thomas Award from the Overseas Press Club of America, and the Global Health Council’s Excellence in Media Award. He has also received science journalism prizes from the American Medical Association, American Society for Microbiology, and American Association for the Advancement of Science. His 2003 book, "The Beast in the Garden," received a Colorado Book Award. In pursuit of stories, David has braved erupting volcanoes (in Iceland and Montserrat), endured swarms of African safari ants (in Uganda), and journeyed to the very bottom of the earth — the South Pole. When not on assignment, his preferred activity is hiking in the Rocky Mountains near his home in Boulder, Colorado.