(written from a Production point of view)
Karole Selmon is the actress who portrayed the Ligonian Yareena in the Star Trek: The Next Generation episode "Code of Honor". She also worked as a Starfleet officer at the Star Trek: The Experience theme park attraction at the Las Vegas Hilton.
Selmon started her acting career in the late 1970s with her part as Sheila Moran in the Bill Cosby/Sidney Poitier crime comedy A Piece of the Action (1977) which also features Trek performers Marc Lawrence, Henry Kingi, Sr., Bob Minor, and Julius LeFlore. The following years she had guest roles in the drama series Roots (1977, starring LeVar Burton), The White Shadow (1979 and 1980, with Joan Pringle and TNG co-star Jonathan Frakes), and Hill Street Blues (1981, with James Sikking, Mark Metcalf, Tony Plana, and Barbara Bosson) and a featured role as Harbinger's sister in the 1982 comedy Wacko (with Charles Napier).
Following a part in the 1989 television drama Roe vs. Wade (with Dion Anderson, Jeff Allin, James Avery, Ward Costello, David L. Crowley, Jerry Hardin, George Murdock, Glenn Morshower, Randy Oglesby, Angela Paton, David Selburg, and Kenneth Tigar) she took a break from acting and returned fifteen years later in the 10-8: Officers on Duty episode "Wild and the Innocent" (2004) on screen. This episode also features Rosalind Chao and Richard Tanner. The same year she appeared as a victim in the science fiction short film Apartment 206.
More recently, Selmon portrayed a homeless woman in the drama The Soloist (2009, with Rachael Harris, Stephen Root, and Arne Starr).
Edit