Dr. Martin C. Weisskopf is project scientist for NASA's Chandra X-ray Observatory and Chief Scientist for X-ray Astronomy in the Space Sciences Department at NASA's Marshall Space Flight Center in Huntsville, Ala. Weisskopf has held numerous special appointments during his career. He is a senior co-investigator of the European Space Agency's international X-ray imaging experiment, called IBIS, and the originator of a major experimental research program that began in 1978 that currently concentrates on the development of X-ray optics.