What job title is used for the person who works on behalf of the?
A person who schedules meetings and makes logistical arrangements is known as an administrative assistant or admin. A more skilled admin who works with a very senior executive may be known as an executive assistant or EA. In a different category, a person who acts as a VP's second in command is often called the Chief of Staff. This is often a very skilled person who could become the VP some day with more experience.