Col. Gregory H. Johnson Named CASIS Executive Director, CASIS “Today, Gregory H. Johnson, Colonel (Ret), was named executive director for the Center for the Advancement of Science in Space (CASIS) – the nonprofit entity selected by NASA to manage the utilization of the International Space Station (ISS) U.S. National Laboratory. Col. Johnson will assume his role effective September 1, 2013.” Astronaut Gregory H. Johnson Leaves NASA, NASA