Definition of an Umpire

[LLPA13UmpDan]

What exactly is the Definition of an umpire, and what exactly is their duties?

What I think:

Enforce the Rules as they need to be to keep a level playing field
Proper Conduct- fancy term for "behavior"

The umpire is the one who is responsible for the game; he is "in charge", and should A. Ensure no team is gaining an advantage; by enforcing rules and to B. Keep behavior issues under control and out of the game. Coaches, Managers, and Players should be dealt with accordingly when not acting appropriately. The umpire should be firm and do as necessary to keep the game going fairly.

Any one disagree; your thoughts?