Meet the Expert: Carl Sandifer, Manager, Radioisotope Power Systems Program, NASA Glenn Research Center Mr. Carl E. Sandifer II is the Chief of the Radioisotope Power Systems (RPS) Program Office in  the Space Flight Systems Directorate at the National Aeronautics and Space Administration (NASA) Glenn Research Center (GRC).  In this position, Mr. Sandifer also serves… Continue Reading Episode 135: How Do You Power a Spacecraft?