Mr. Simpson worked at the Fort Worth Livestock Exchange weighing, selling and delivering cattle by train to buyer destinations. His first full time employment as an artist was with Peerless Press in Oklahoma City. Around 1920 Wallace became Cowboy Artist for the Worth Star-Telegram. For ten years in Fort Worth he created numerous sketches and oil paintings on both a commission basis and to support many newspaper articles. In 1930 Wallace moved to the Dallas Morning News, serving the dual role of writer and artist.