watch 01:48 The Loop (Movies) Do you like this video? Douglas Keever is a construction superintendent who lives in Sherrills Ford, North Carolina. He performed the voice of Doug R.M. in Cars, and was also the inspiration for Mater, due to his nickname "Mater". Retrieved from "https://pixar.fandom.com/wiki/Douglas_Keever?oldid=209713" Categories: Cars Actors Community content is available under CC-BY-SA unless otherwise noted.