Project manager and scientist of NASA's role in the European-led Rosetta mission to study Comet Churyumov–Gerasimenko.

Alexander worked for the United States Geological Survey and NASA's Jet Propulsion Laboratory beginning in 1986, and was the project manager of NASA's Galileo mission to Jupiter. The mission discovered 21 new moons of Jupiter and the presence of an atmosphere on Ganymede. The discovery of the atmosphere, more precisely a "surface bound exosphere", caused scientists to rethink their assumptions that Ganymede was an inactive moon. Alexander later served as project manager and scientist of NASA's role in the European-led Rosetta mission to study Comet Churyumov–Gerasimenko.

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Category:
Astronomy - Planetary Science

Completion Status:
yes

Patent Number:
N/A

Co-Inventor:
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