a bio?

I signed up to be on some panels at Arisia this year. I don't know for sure which panels they'll approve and which ones they'll put me on, but the ones I want most are a poly panel, and these two LJ panels that I proposed. I'm supposed to write a short "bio" they could put in the panelist blurbs section of the program booklet (500 character limit). What do I write?

Are these like the silly blurbs you see in community theater play programs, or background relevant to the panels, or random info about the person? I'm stuck about how to start. Comment some suggestions for me? Or if you want, write a whole proposed mini-bio I could use if I like it.