NASA/MIT/Draper: Software Engineer starting with Apollo 8 (incl. Apollo 11); co-wrote the software for the command module program turning the engines on and off
Engineer on the Voyager mission since the day it launched: September 5, 1977. He works on Voyager's flight data systems, which have just 64 kilobytes of memory (0.000064 gigabytes) and run a long-since retired computer language
Scientist; MIT; NASA. Principal investigator for the Gravity Recovery and Interior Laboratory (GRAIL) Mission (2011-2012); other planetary mission participation: NASA LRO, MRO, Dawn, NEAR, Mars Global Surveyor