We all have mixtures of traits.

When that mix becomes very skewed and one sided, then
that person falls into the personality disorder category.
When THAT becomes severe, they become "emotional vampires".
The psychologist who wrote that book, is a motivational speaker
who goes to businesses and addresses interviewing new employees or fixing conflicts that arise in the business world.
These extreme types can drain resources and cause terrible upheaval.

There is another book I got from the library, called Snakes in Suits. That one addresses mostly Narcissistic psychopathic types. One of the authors of this book is a Canadian psychologist who has specialized in psychopathy for 20 yrs. He has some really interesting books!
I have seen this dynamic unfortunately in action! I decided to retire in fact early because the place I worked at could not deal with this problem...it was running amok!

http://www.communities.hp.com/online...PPost4330.aspx