D.B is not mentioned frequently in the novel, but here are some facts:-he is an author in Hollywood-he is pretty wealthy-he cares about Holden (in the end he comes to check on him)-is is Holden's...
Holden Caulfield wants to the catcher in rye simply because he understands his own mental as well as social predicament that he suffers from and he wants to protect other children from such traumas....