First person I introduced to D&D. My freshman college room mate, Steve Woodward. 1e, he had Magic User as I recall. We roomed together a couple of years, then he went his New Age way and I went mine. He didn't stay in the hobby either as far as I know.
The first guy I introduced to RPG's was a kid in high school named Jeff Bucklew[sp?]. But that was Chivalry & Sorcery, not D&D.