As NASA Chief Scientist for Orbital Debris at the Lyndon B. Johnson Space Center, Mr. Johnson serves as the agency authority in the field of orbital debris, including all aspects of environment definition, present and future, and the operational and design implications of the environment to both manned and robotic space vehicles operating in Earth orbit. He is responsible for conceiving, conducting, and directing research to define the orbital debris environment, for determining operational techniques for spacecraft to protect themselves from the environment, and for recommending techniques to minimize the growth in the future orbital debris environment. Mr. Johnson coordinates NASA's orbital debris research with similar research conducted by other US agencies, other national space agencies, and international organizations. Mr. Johnson serves as the head of the US delegation to the Inter-Agency Space Debris Coordination Committee (IADC), comprised of the world’s 12 leading space agencies, and serves as the US expert at United Nations in matters concerning orbital debris. He is recognized internationally as an authority on orbital debris and foreign space systems and is the author of eighteen books and more than 200 papers on these topics during the past 32 years.