I'm a published translator, and I was a published translator before I started fanfic. I deliberately picked a name that couldn't be automatically linked to my translations. I have also recently removed several things that might help identify me from the interests lists of my LJ.

My fanfic identity is completely seprarated from my real name, and I'm happy to keep it that way, as my fannish writing is quite different from my translations.

There's also the issue of snobbery in my "day job" - I really don't think my colleagues or students would react that well to finding out that I wrote Harry Potter fanfic. There's a lot of anti-HP snobbery in academe.