Which gamer. Now that really affects things in a certain way. Hmm. I guess I would have to cite them seniors in the school bus who once allowed me to play for the first time a short and meaningless death. (That was my very first game session.) From that point on, I felt committed that any game I ever ran would be something the players would enjoy. So you can say, gamers who didn't want me to play affected how I play role-playing games now.
I probably would also have to cite John Wick. Although I've never gamed under him, I know a lot of his philosophies on gaming and having fun affected me after I read his books (particularly Houses of the Blooded, and later on, his Play Dirty stuff). The new concepts inside were definitely mind-blowing for me just as the others were self-affirming that I was doing the right thing.