sentences:  For these innovations, his advocacy of space exploration and human spaceflight, and his role in founding JPL and Aerojet, Parsons is regarded as among the most important figures in the history of the U.S. space program.He has been the subject of several biographies and fictionalized portrayals.Marvel Whiteside Parsons was born on October 2, 1914, at the Good Samaritan Hospital in Los Angeles.