I'm surprised they needed a study for this. About seven years ago I worked for a large pharmaceutical company and had the absolute boss from hell. I'm a programmer and she was a director who somehow got her job although she could scarcely add an attachment to an email. What's more, she *knew* she didn't know her ***** and therefore compensated by being a super bitch. The ***** she did was legendary.o I didn't see this one personally, but my direct manager told me about a meeting where she was stressing out a guy so much that his nose started to bleed right there!o Another worker in another department (we used to go to lunch all the time, so I knew him) used to be an amateur bodybuilder. He even showed us pics of him competing. He was transferred to her department. Within three months of working for her, he was on blood pressure medication for the first time in his life.o She once deducted money from a *salaried* employee for showing up late. When this same employee (the manager in the first bullet point) mentioned to her that during that same period there were two days that she worked over 14 hours, the bitch (and I *rarely* call women bitches, but she more than deserved it) responded, "But you're a salaried worker. You don't get paid overtime." (!!!)o The guy I was taking over for (who was extremely smart) landed up getting an ulcer working for her.There are more stories like this, but I'll cut it here. Long story short, I was fired after only six months because I actually challenged this bitch. It was the best thing that could have happened to me all things considered because it got to the point where I could feel the constant stress of the poisonous environment affecting me.