Daniel is an investigative reporter at National Public Radio's Washington bureau. During his many years at NPR he has covered a wide range of issues, including the environment, the health care system, civil liberties and development in Third World countries. His reports on the Army’s treatment of soldiers returning from Iraq and Afghanistan with serious mental health problems and brain injuries prompted the U.S. government to change its policies on treating military members. He investigated NASA’s decision to launch the space shuttle Challenger despite warnings that it might explode. His reports have won every major award in radio broadcasting, including the Alfred I. duPont, George Foster Peabody, Edward R. Murrow and Robert F. Kennedy awards. He has taught media ethics as an adjunct faculty member at American University and speaks about investigative reporting at colleges around the country.