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G.B. Halsted was a mathematics teacher at the University of Texas at Austin in the early twentieth century. He was interested in and a supporter of non-Euclidean geometry and translated its two founders, Janos Bolyai's and Nikolai Lobachevsky's, books about it into English. He advocated teaching non-Euclidean geometry in high school instead of traditional Euclidean geometry, which he viewed as obsolete.  

'''G.B. Halsted''' was a mathematics teacher at the [[University of Texas at Austin]] in the early twentieth century. He was interested in and a supporter of [[non-Euclidean geometry]] and translated the books of its two founders, [[Janos Bolyai]] and [[Nikolai Lobachevsky]], into [[English]]. He advocated teaching non-Euclidean geometry in high school instead of traditional [[Euclidean geometry]], which he viewed as obsolete.  

Source  

Source  

''A History of Mathematics Education in the United States and Canada'' National Council of Teachers of Mathematics (NCTM) yearbook.

''A History of Mathematics Education in the United States and Canada'' National Council of Teachers of Mathematics (NCTM) yearbook.