(written from a Production point of view)
Stephen Davies is an actor who guest starred in three episodes of the two Star Trek spin-off series Star Trek: Deep Space Nine and Star Trek: Voyager. The jacket worn by him in the episode "Darkling" was sold off on the It's A Wrap! sale and auction on eBay and also re-used in several DS9 episodes. 
Davies has started his acting career in the 1970s and has appeared in films such as Inserts (1974), The Hostage Heart (1977, with Sharon Acker, Bob Minor, and Ed McCready), Heart Beat (1980, with John Larroquette and John Hostetter), The Razor's Edge (1984, with Catherine Hicks), The Hanoi Hilton (1987, with David Soul, Lawrence Pressman, John Vargas, Rick Fitts, Brian Demonbreun, and Bill Cho Lee), Rage and Honor (1992, with Brian Thompson, Alex Datcher, Tim de Zarn, and Faith Minton), Alien Intruder (1993, with Tracy Scoggins and Bill Zuckert), Dillinger and Capone (1995, with F. Murray Abraham, Catherine Hicks, Anthony Crivello, Jeffrey Combs, Time Winters, Clint Howard, Bert Remsen, Jeffrey Dean Morgan, Jessica Hendra, and Debi A. Monahan), Ladykiller (1996, with Tim de Zarn), Star Portal (1998, with Athena Massey and Anthony Crivello), and Iolanthe (2002). Several films he played in were produced by Roger Corman.
He has also performed in television series such as Starsky & Hutch (1976, starring David Soul), Dallas (1978, in an episode directed by Lawrence Dobkin), CHiPs (1981, with Robert Pine and Marc Alaimo), Scarecrow and Mrs. King (1984), The Secret World of Alex Mack (1995), and J.J. Abrams' Alias (2002, with Terry O'Quinn).