It used to be Kate DiCamillo (Tale of Despereaux, Because of Winn Dixie, etc.), but he hasn't read any of her stuff in a couple of years. Right now, he likes Norton Juster (Phantom Tollbooth) and anything classic (Robin Hood, Little House, 20k Leagues, Muskateers, Swiss Family Robinson, etc.)
... and who DOESN'T wish there were more Dr. Seuss?

He's always been a fave at our house. We got the board book editions when the boys were babies. They loved it. Did you know there's a new Lorax moving coming out?