Re: mental health and depression
greg1, my first reaction is that of a layperson's.
Here goes: Yes, it is definitely possible, even probable, to be depressed in, e.g. one's personal life, and have that manifest by overinvolvement in, e.g. one's professional life.
That would cause people to see the professional/work facade as the person and most people in that area of the depressed person's life will go no further.
However, if the depressed person still has friends, family, home etc., and nobody is doing anything to help, it is no wonder to me that the behavior you describe has manifested and the depressed person's behavior is a coping mechanism. Moreover, in this layperson's opinion, the depressed person must reach out to others in order to reverse what might be a complete breakdown.
Have you seen this site?
http://www.nimh.nih.gov/publicat/depression.cfm
It might be of help ...