Thanks to the Underdark Gazette which referred me to this great article over at The Delve.
There are lots of other great links over there, go check it out.
The article was written in 1980 by John Eric Holmes, and talks about him DM'ing various groups of people. Interestingly, he seems to be playing AD&D with his groups, and the gameplay is definitely not PG-13. For example:
He talks about violence in the game as a release, interparty conflict, the differences between DM'ing teens v. college age/grad students, chating and how he rolls all dice out in the open, and DM's needing to have the ability to go outside the rules and wing it.
Very interesting article.