(written from a Production point of view)
Witney made his television debut as a regular on the ABC drama The Travels of Jaimie McPheeters, which aired during the 1963-64 season. Fellow TOS guest star Meg Wyllie was also a regular on this series. He went on to work with a number of other TOS alumni while making appearances on The Richard Boone Show (with Warren Stevens), Bonanza (four episodes, including one with Glenn Corbett, another with Hal Baylor, and yet another with Morgan Woodward), Gunsmoke (with Charles Seel), Twelve O'Clock High (with Robert Lansing, Frank Overton, and Bert Remsen), Daniel Boone (with Jon Lormer), The F.B.I. (with Jonathan Lippe and Ken Lynch), Owen Marshall: Counselor at Law (with William Schallert and Louise Sorel), The Sixth Sense (with Jason Wingreen), and Cannon (with Barbara Babcock, Bill Erwin, and William Sargent). He was also seen in three episodes of Charlie's Angels, including one in 1978 with future Star Trek: The Next Generation star Jonathan Frakes.
He has also been seen in a number of films, with his first being the 1967 Western The Way West. He then had a supporting role in the 1970 Blake Edwards musical Darling Lili and played Ike Clanton in the 1971 western Doc, based on the life and times of Doc Holliday. Star Trek: Deep Space Nine guest actor Harris Yulin played Wyatt Earp in this film. The following year, Witney played the lead role in the TV movie The Catcher, which also starred Andrew Robinson.
In 1974, Witney starred with supermodel and singer Twiggy in the film W, in which Eugene Roche also starred. Witney and Twiggy married three years later; their union produced a daughter, Carly. Witney and Twiggy appeared together in one more film, 1980's There Goes the Bride, before Witney's untimely death of a heart attack three years later at the age of 52.