House Md Tv In The Popular TV Show House MD, Is James Wilson Currently Resigned From The Hospital?

In the popular TV show House MD, is James Wilson currently resigned from the hospital? - house md tv

One of my friends and I have a little discussion about this is now Wilson's resignation from the Princeton-Plainsboro Teaching Hospital (as of 1/21/09)? That is, if you resign now, the second time he stepped out of the series. So, what is in the hospital or not?