Real World article
(written from a Production point of view)

Mel Ladia is an actor who appeared as a Bre'el IV technician in the Star Trek: The Next Generation third season episode "Deja Q". He received no credit for this appearance but was identified by the name tag of his costume which was sold off on the It's A Wrap! sale and auction on eBay. The costume was later also worn by background actor Peter Martin on Star Trek: Deep Space Nine. [1]