(written from a Production point of view)
Margaret Prentice who previously received credits as Margaret Bessara is a makeup artist who applied the makeup and facial hair to the Klingon actors David Warner, Kurtwood Smith, and Robert Easton in Star Trek VI: The Undiscovered Country. (Cinefex, No. 49, p. 50) She also worked as Prosthetic Makeup Artist on Kimberly Arland's character Madeline for 2009's Star Trek and its 2013 sequel Star Trek Into Darkness. 
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