Louis Agassiz (American, 1807 – 1873)
Albert Henry Munsell (American, 1858 – 1918)
Columbia University Teachers College (American, 19th/20th Century)
Edward Herbert Barnard (American, 1855-1909)
Columbia University Teachers College (American, 19th/20th Century)
Charles Dana Gibson (American, 1867 - 1944)