Paul Cornoyer was born in 1864 in St. Louis, Missouri. In 1889 he went to Paris to study at the Académie Julian under Jules Lefebvre, Benjamin Constant and Louis Blanc. He is best known for his art, prints and posters of New York City street scenes. These are meticulously observed.
His color scheme deliberately limited to the context of each painting. His art, prints and posters are scattered throughout the country in Art Museums in Brooklyn, Dallas, Kansas City, Newark, and St. Louis.
Paul Cornoyer was a much beloved teacher. For most of his life, he taught at the Mechanics Institute in New York, and later in 1917 in East Gloucester, Massachusetts. At the time of his death in 1923 he was involved with setting up an exhibition of art, prints and posters for the local art association.