Andy Borowitz, Tracy Klugian and Harland Dorinson

For a couple of years now I've subscribed to The Borowitz Report and I am a big fan. I also have a good memory for names, which could be why I noticed that Borowitz recycles them. Very often he attributes quotes from spokesmen, men on the street, or experts to either Harland Dorinson or Tracy Klugian. Also, Davis Logsdon, as I discovered writing this blog. And there may be others. By the way, Tracy is always "he," as far as I can tell, although Tracy can be a woman's name, too. As to the use of "he," Mr. B. should read NE-NER-NIS to learn how easily he could avoid choosing a sex for ambiguously-named persons.
          Nowhere on the web could I find a mention of the ubiquity of Klugian and Dorinson. This leaves me wondering whether they are completely fictitious or just (un)lucky enough to be associated with so many different statements and fields. They also grow old and young and old again at Andy's fancy: he always