"Planetary geology: To Mars and beyond!": Philadelphia Geological Society, April, 2004
"To the edge of the Solar System: Exploring the Kuiper Belt": Rittenhouse Astronomical Society (Philadelphia), November, 2002
"Our Solar System, Other Solar Systems": Flower and Cook Observatory (PA) Open Observatory Night, February, 2002
"Try this at home!": Lick Observatory (CA) Summer Visitors Program, July, 2000
"Our Solar System, Other Solar Systems": Lick Observatory (CA) Summer Visitors Program, August, 1999