If you've never encountered a jerk at work, consider yourself lucky. Most workplaces host a smattering of people with toxic personality traits that make life miserable for managers and employees alike. Behaviors such as bullying, gossiping, incivility and slacking pollute the work environment, erode cohesion, lower morale, reduce productivity and even nudge good people to quit. Peter Economy, The Leadership Guy at online magazine Inc., offers advice and time-tested strategies to identify, manage and prevail over toxic types and forge a professional, positive and safe work environment.