Delmar "Barney" Roos

Delmar Gerle "Barney" Roos (October 11, 1888 – February 13, 1960) was an American automotive engineer who served as Studebaker's head of engineering from 1926 to 1936, 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.

Delmar Roos was born in the Bronx and attended Manual Training High School, Brooklyn, New York, then studied for degrees in electrical and mechanical engineering at Cornell University. He gained distinction as a photographer —a picture he took of a three-horse fire-engine team was syndicated throughout the world— and as an athlete (winning the intercollegiate and national fencing championships). He has been described as tall, well built and handsome, and a brilliant conversationalist on art, drama, economics, politics and science.

On graduating from Cornell in 1911, he joined General Electric and worked under Sanford Alexander Moss on steam, gas turbine and centrifugal compressor development. In 1913 he went to Locomobile as assistant research engineer. In 1919, he was assistant to Pierce-Arrow's David Fergusson and succeeded him as chief engineer in 1921 before rejoining Locomobile as chief engineer in 1922. After an intermediate stint with Marmon in 1925, he succeeded Guy P. Henry as Studebaker's chief engineer in 1926.

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