(written from a Production point of view)
Steve Diamond is an actor who was a regular background performer on Star Trek: Deep Space Nine and also appeared in Star Trek Generations. His costume from Generations was sold off on the It's A Wrap! sale and auction on eBay. 
Diamond appeared in episodes of Bosom Buddies (1982, with George Murdock) and Time of Your Life (1988).
Star Trek appearances
(This list is currently incomplete.)