Delmar Gerle "Barney" Roos (11 October 1888 – 13 February 1960) was an American automotive engineer who served as Studebaker's head of engineering from 1926[1] to 1936,[2] specialising in straight-eight engines. He later worked for the British Rootes Group in the design of Humber, Hillman and Sunbeam Talbot cars. Before World War II, he returned to the United States, where he co-designed the Willys MB, the original Jeep.