The Titan's curse part 6

[Jake]

The half bloods and campers arrive at camp half blood. Apollo departs in his flying sun car. The hunters are not to be around men and do not mix well with gods and demigods, so they request to stay in a separate cabin. It is winter at camp half blood, so there are not nearly as many campers as in the summer, only the ones who stay year round. Percy, Thalia, Grover, and Nico meet up with Chiron, a friend and camp official, and Mr. D, the camp director. Nico is introduced, and Percy explains what happened to Annabeth.

[Ethan]

To refresh my memory I was wondering if Mr. D was the guy in the wheelchair. I do reconize most charactures but Mr.D stumps me.