Cold Boots: Book 10 in the humorous scifi series

Peace Force: Book 1 in the Harriet Walsh series

The Invasion Chronicles (Books 3 and 4)

No Free Lunch: Book 4 in the Hal Spacejock humorous scifi series

Sierra Bravo: Book 3 in the Harriet Walsh series

Baker's Dough: Book 5 in the Hal Spacejock humorous scifi series

Safe Art: Book 6 in the Hal Spacejock humorous scifi series

The Secret Signal

Big Bang: Book 7 in the Hal Spacejock humorous scifi series

Double Trouble: Book 8 in the Hal Spacejock humorous scifi series

Just Desserts

The Gyris Mission: Book 3 in the Hal Junior series

Opposition

The Missing Case: Book 2 in the Hal Junior series

First Meetings: In Ender's Universe

The Comet Caper: Book 4 in the Hal Junior series