(written from a Production point of view)
Ken Gruz is an actor who was a regular background performer, stand-in, and photo double on Star Trek: Deep Space Nine, Star Trek: Voyager and Star Trek: Enterprise. He also appeared in the video game Star Trek: Klingon.
A black and gray undershirt previously worn by Leonard Nimoy in Star Trek: The Motion Picture, that was later worn by Ken Gruz in an episode of Deep Space Nine, was sold off in the It's A Wrap! sale and auction on eBay  as well as a blue jumpsuit worn by Gruz in the episode "Workforce",  a Klingon belt from his appearance in Enterprise,  and his costume as Vulcan medical technician in the episode "Stigma". 
Beside his work on Star Trek, Gruz was featured in the independent film Talking to Strangers (1988), in an episode of the documentary television series Literary Visions (1992), and in the horror thriller Killer Me (2001).