Who is Harry Gooddorf from The Pat Hobby Stories and what is their importance?

Harry Gooddorf appears in Pat Hobby's Christmas Wish. He is an executive at the studio where Pat sometimes works. While Pat is working over Christmas Eve, Gooddorf's old secretary is sent to work with him. She complains because Gooddorf recently replaced her with a younger woman. The woman tells Pat about a letter she once stole a copy of in order to have something to hold over Gooddorf's head if it were ever necessary. Pat then decides to use the letter to blackmail Gooddorf into giving him a producer's job. Unfortunately, Pat does not have all the information he needs and finds out that the letter was not an admission of guilt in a murder plot as Pat thought, but the admission of guilt in letting a friend down.