Rule 615. Exclusion of Witnesses
At the request of a party the court shall order witnesses excluded so that they cannot hear the testimony of other witnesses, and it may make the order of its own motion. This rule does not authorize exclusion of
(2)
an officer or employee of a party which is not a natural person designated as its representative by its attorney, or
(3)
a person whose presence is shown by a party to be essential to the presentation of the party’s cause, or