Navigator for the Magellan Spacecraft's radar mapping of Venus (1991-1993).

Planned and implemented navigation for the first interplanetary aerobrake (1993).

Developed the on-site orbit determination software system used at Arecibo, Peurto Rico and Goldstone (Mojave Desert) planetary radar sites for asteroid tracking, participating in 40+ radar acquisitions (1994-1997).

Wrote Jet Propulsion Laboratory's horizons on-line ephemeris system providing reference standard dynamical ephemerides for 40,000+ solar system objects to 100,000+ world-wide users per year.

Member of navigation and radio science teams, doing orbit determination for the "near" spacecraft's orbital mapping of 433 Eros.