Fred D. Crawshaw was a professor of manual arts at the University of Wisconsin. Born in Minnesota in 1874, he received his ME in 1910 from Worcester Polytechnic Institute. He lived in Madison, Wisconsin.

E. W. Lehmann was a professor and the chair of the department of agricultural engineering at the University of Illinois from 1921 to 1955. He lived in Champaign, Illinois.

Byron D. Halsted was born in 1852 in Venice, New York, and was a noted botanist and educator. He received degrees from Michigan State University and Harvard University and was managing editor of the American Agriculturist, where he first published Farm Conveniences and Barns, Sheds, and Outbuildings. Halsted lived in Newark, New Jersey, and died in 1918.

James H. Stephenson was a mechanical engineer and author of several self-educational books on the subject of tractor farming and tractor engineering. He lived in Chicago, Illinois.