A member of the NASA Public Affairs team in Washington, D.C., Marianetti helped coordinate the highly successful campaign to sell the space program to the American public and the world--especially the Apollo program, Moon landings, and early Space Shuttle missions. Marianetti's primary job was to get astronauts at the Manned Space Craft Center in Houston out of their space suits and on the road as salesman to help promote the program through public appearances, speeches, interviews and media exposure. At the same time, he worked to develop an agencywide guest invitation plan to handle visitors and the general public for the upcoming Apollo launches at the Kennedy Space Center in Florida.