Who is Dr. Osgood Mulford Twelge from Without Feathers and what is their importance?

Twelge, a paranormal investigator, is the author of a soon-to-be-released book entitled Boo! Twelge, with three names and the title "Dr.," as well as the title of professor of ectoplasm at Colombia University, is presented as an authority and acts as the narrator of excerpts of his own book. Twelge's accuracy and intelligence are taken for granted because of his position and title, something that Allen purposefully makes fun of in his presentation.