History of geometry
Classic geometry was focused in compass and straightedge constructions. Geometry was revolutionized by Euclid, who introduced mathematical rigor and the axiomatic method still in use today. His book, "The Elements" is widely considered the most influential textbook of all time, and was known to all educated people in the West until the middle of the 20th century.
Lon R. Shelby
Lonnie Royce (Lon. R.) Shelby (born 1935) is an American academic, and Professor Emeritus of Speech Communication and former Dean of the College of Liberal Arts at the Southern Illinois University. He is known for his work on Mediaeval architects and design, especially on the work of Lorenz Lechler, Mathes Roriczer, Hanns Schmuttermayer, Taccola and Villard de Honnecourt. He is also known for coined the term "constructive geometry."