Gary Werntz (born 24 July 1948; age 76) is the actor who played the Tilonian Mavek in the Star Trek: The Next Generation sixth season episode "Frame of Mind".
Werntz is married to director and producer Mimi Leder and his brother-in-law is Reuben Leder who wrote TNG: "The Perfect Mate".
He has made guest appearances on L.A. Law (including the pilot episode, with Corbin Bernsen), China Beach (starring Robert Picardo and Concetta Tomei), and Firefly (with Ron Glass). He also had roles in the films The Peacemaker (1997, with Matt Winston, Richard Poe, and Bruce Gray), Deep Impact (1998, with James Cromwell, Denise Crosby, Merrin Dungey, Concetta Tomei and Kurtwood Smith), and Pay It Forward (2000, with Jeannetta Arnette, Tina Lifford and Tim de Zarn), all of which were directed by his wife, Mimi Leder.