A forester can simply be described as a person which practices the art of forestry. Such a person is involved in managing a forest. The job of a forester might be given by the government to ensure the proper maintenance of a forest or it might be through a private company. Nowadays, the government of the USA is hiring bachelor level or master level people for this job so that a forest can be managed more properly.
A forester works best to conserve the art of a forest and he takes special care to preserve the wildlife animals and plants of the forest.
