A legal assistant performs many jobs. Typically, legal assistants type up legal letters and briefs dictated by attorneys. They put together briefs prepared by lawyers and arrange them to be properly filed with the court and served on opposing parties. They take messages for their supervising attorneys, sort through mail, and manage the calendar including determining deadlines for filing motions, complaints, and responses to motions. Depending on the skill set, some legal assistants also perform some legal research.