(written from a Production point of view)
Yvette Callum is an actress who played a 25th century Starfleet officer in the final Star Trek: Voyager episode "Endgame". She received no credit for her work and was identified by the name tag of her costume which was sold off on the It's A Wrap! sale and auction on eBay. 
Callum is currently working as a realty agent.