Not any specific one, but I was a huge fan of Frank Jacobs, I guess he wrote the plurality of the song parodies for MAD, Sam Hart, a few others, but that was also where I was first exposed to the art form of song parodies.
It's hard to say, I picked one of my favorite articles for the MAD vault. Which is one of the features of the Magazine so they don't have to actually pay artists or writers to come up with new stuff.
I like to think that I've gotten better at what I do. I spend more time and pay more attention to detail album after album. But pretty much it's stayed the same.