This person is rotten to the core! W M Wrigley Jr Co needs to send him on down the road. He is like a cancer within. The only thing on this persons mind is to use every possibility to further his career no matter the hurt or cost to dedicated families or coworkers. I am not a coworker of Mark but just an ear and what I hear from him, simply put is use use use others to reach his goal, some of the things he has bragged about would make you sick! If you work with him than you know. read full review »