Who is T. Stedman Harder from A Moon for the Misbegotten and what is their importance?

T. Stedman Harder is Hogan's neighbor. He is in his late 30s, and he is a millionaire. Coddled his entire life, Harder has no sense of humor, which makes things more challenging when he visits Hogan, since humor is Hogan's principal form of communication. Harder is intimidated by Hogan.