Gina Ippolito writes about how she got staffed on her first TV show:

I went to the meeting and basically just talked with three of the dudes who work on the show, including the creator. They asked me about myself and I talked about my love of geeky sci-fi shows, the stuff I do at UCB and iO, and the fact that I’ve been playing chess competitively since I was little. The creator was also a huge chess nerd. One of the other guys loved sci fi shows. We geeked out for a while. Basically I just hung out with them and I left the room feeling like it was a fun time. The next day they emailed me to say they’d like to staff me.

So that’s the story. No insane coincidences, no extreme nepotism, no “I saved the life of the president of Cartoon Network’s daughter from being hit by a car so they gave me a job!” All simple, straightforward, and something that anyone could accomplish, with the right tools.

Ippolito’s tools include persistence, collaboration, and being nice to everyone along the way. It’s classic advice, but also easy to forget.

You should also read her post on How to Get and Keep Writing Jobs.