Henry and Lin Oliver co-wrote the Hank Zipzer series of books. The nine books include:
- Niagara Falls, or Does It?
- I Got a "D" in Salami
- Day of the Iguana
- The Zippity Zinger
- The Night I Flunked My Field Trip
- Holy Enchilada!
- Help! Somebody Get Me Out of Fourth Grade!
- Summer School! What Genius Thought Up That?
- My Secret Life as a Ping- Pong Wizard