After spending the summer of 1908 at Chadds Ford painting with Howard E. Smith and N.C. Wyeth, Cahill returned to New York in the fall. In 1918 he became a professor of drawing, and painting, at the University of Kansas. Cahill was a member of the Salmagundi Club in New York.

Examples of his work are in the collections of the Museum of History, Science and Art in Los Angeles, California and the Municipal Collection, Pheonix, Arizona.

Pyle Students