The harasser can be the victim's supervisor, a supervisor in another area, or a co-worker. The harasser can be someone who is not an employee of the employer, such as a client or customer, but comes into contact with the person through work duties. This is called third-party harassment.
Harassment outside of the workplace may also be illegal if there is a link with the workplace. For example, if a supervisor harasses an employee while driving the employee to a meeting or at a conference. Harassment can also occur in social settings away from work.
The victim can be a bystander witnessing harassing behavior by others.