(written from a Production point of view)
George Barr is a makeup artist who assisted the makeup staff for the The Original Series episode "The Way to Eden". Barr lived with John and Bjo Trimble during the late 1960s, and was at the time a Screen Gems special effects artist.
Bjo recalled in On the Good Ship Enterprise, p. 249, that Barr joined them the day she visited the set of Here Come the Brides. On set, they met several Larry Abbott, a former colleague of Barr's, who worked together at Paramount on the episode "The Way to Eden" "when the extra makeup load required more craftspeople."