Walter Trier was an illustrator, who mainly worked for children's books and magazines like Lilliput. Born in Prague during the Austrian-Hungarian Empire into a Jewish German-speaking family, he studied arts in Prague before enrolling at the Royal Academy of Munich in 1906. He settled in Berlin in 1910. Trier's work appeared in magazines like Simplicissimus and Jugend in 1909, and from 1910 he also contributed to Otto Eysler's Lustige Blätter and Berliner Illustrierte Zeitung. Since the late 1920s he was the regular illustrator of the children's books by Erich Kästner.
Trier's work was heavily opposing the Nazi government and by 1936, he and his family were forced to flee to England. He continued to provide anti-Nazi artwork for the British Ministry of Information during World War II. In England, he also began a longtime association with the small-format monthly humour magazine Lilliput, for which he designed the front cover from the first issue in 1937 until 1949. He moved to Canada in 1947, where he made illustrations for the company Canada Packers. He passed away in Craigleith, near Collingwood, Ontario, from a heart attack in 1951.