12 Leaders Share Their Biggest Management Pet Peeves

Everyone has things that make them tick, and that's especially true for powerful leaders who frequently deal with people.

From half-baked ideas to working around the clock, we've collected the management pet peeves of 12 of the world's most influential leaders.

Most items on the list are smart things to avoid in general. For example, media mogul Oprah Winfrey is likely not the only person that considers loud gum chewing unprofessional. And if you ever get the chance to meet one of these people, you'll know what not to do around them.