Extra Working
Some people have the main job and spend some time to second career. The reasons for that are different. Some people don't have enough money to make both ends meet. That's why they have to take some extra work. Others think that they are professionals in their main job and want to open some new fields for them. May be they have some others abilities that need to be developed. The reasons are different, so is the reaction of bosses. The point is how this second career is organized. If not in the prejudice of the main one, everything is all right. But if it becomes to take the leading position, it's bad for employers.