The Answer Is . . . (Unabridged)
2020
100 Places to See After You Die (Unabridged)
2023
The Serving Leader, 2nd Edition : Five Powerful Actions to Transform Your Team, Business, and Community
2016
Planet Funny (Unabridged)
2018
Maphead : Charting the Wide, Weird World of Geography Wonks
2011
Brainiac: Adventures in the Curious, Competitive, Compulsive World of Trivia Buffs (Unabridged)
2026