A manager is a person hired by the actor to find work, give advice, and generally guide the actor's career.
Many people assume that agents and managers are pretty much the same thing.
So even if you have a manager, you will still need either an agent or an attorney familiar with contracts and the entertainment industry. A manager's main focus is on guiding the actor's career and making connections, and although most of the best managers out there are former agents, the two have very different roles. Unfortunately, some of the most common scams in the entertainment industry involve people who call themselves managers, as this occupation is not regulated by any of the actors unions. These unscupulous people will often promise the newcomer fame and fortune, but only for an upfront fee. Of course this is not true of all managers.