But that was my proudest time, editing that newspaper for a year and a half." He returned to DC after he was discharged from the Army in 1946. In the post-war period, he drew "Johnny Thunder", the "Justice Society of America", "The Flash" and "Green Lantern". Before the creation of "Dondi" in 1954, Hasen drew a comic strip adaptation of "The Goldbergs" radio/TV series which ran in the "New York Post" in 1944 and 1945. Hasen, an active member of the National Cartoonists Society, met Gus Edson while on a tour of Korea and together they created the Dondi comic strip, with Edson writing and Hasen drawing. From September 1976 until May 2007 Irwin was an instructor at the Kubert School in Dover, New Jersey. He also taught cartooning classes at The School of Visual Arts in New York City. Hasen suffered a minor stroke on April 24, 2007. Hasen died March 13, 2015, at the age of 96. Hasen received the National Cartoonists Society's Story Comic Strip Award for "Dondi" in 1961 and 1962.