He's a forger who's so good that galleries can mistake his work for originals made by esteemed masters. He gave Cafe Artiste a Johan Oldenveldt forgery to pay off his Strupo tab.
He later painted pictures to help Homer and Kirk's marriages. He painted a group portrait of the Van Houten family for Kirk and a perfect reproduction of Marge's destroyed sailboat painting for Homer. In return, Homer paid him in Strupo.