Do you have a toxic co-worker or gaslighting boss? If you do, you need this field guide to understand the motivations of the 7 different types of "Jerks at Work". Associate Professor Of Psychology Tessa West has identified a taxonomy of personality types ranging from the cunning to the intentionally devious. It's a book which puts power back in the hands of those dealing with bad behaviour of others at work. Michelle Martin discusses the strategies you can use today in this interview.