What we do
We use the Fine Guidance Sensors aboard Hubble Space Telescope to measure star positions and study binary stars unresolvable using ground-based techniques. The Fine Guidance Sensors provide per-observation relative positions with 0.001 arc second angular precsion. Stellar positions yield information on distance (parallax) and possible faint companions. The orbits of binary stars yield stellar masses.
What we've done
Here are our papers organized by topic. We've provided a beautiful cover for the Astronomical Journal. We also developed software (available to all) to aid us in our analyses.