A verbal offer has recently been extended to me for a tenure track position that I'm 95% sure I want to accept, although I have not officially (verbally or otherwise) done so yet. This position is slated to start at the beginning of the next academic year.
Right now, I am working as a very junior-level "soft money" research faculty at a nearby university (with a considerably more renowned research reputation than the university where the TT job is, if that matters). I have a primary mentor there who I obviously have to notify about my change of position but the question is: when? This mentor is a reasonable person and we get along fairly well but I'm not sure how s/he would react to this news.
Obviously, there is "work in progress" at my current position that I am fully committed to finishing and, in a perfect world, I would maintain my current research collaborations in my new position. I would even accept some minimal responsibilities (not necessarily requesting pay) after I leave to make the transition smoother and to ensure that these collaborations remain strong and I do not leave them "high and dry".
Any advice from the managerial end or from someone who has been in a similar position would be greatly appreciated.