I started at TSR in August of 1978, being the 17th employee. The Dungeon Master's Guide was the first editorial project I worked on, and the Gateway To Adventure catalog was the first product I designed. I co-authored the module C1 Hidden Shrine of Tamoachan and either edited/proofed/playtested most products back then.
I worked in many departments from janitorial to editing to Assistant Manager of the Dungeon Hobby Shop.
Those were the best years of my life as I attended virtually every convention and spent my life "living and breathing" games.