In 1920 and 1926 respectively, Josef Skupa created his most famous puppet characters: comical father Spejbl and his rascal son Hurvínek. In 1930, he set up the first modern professional puppet theatre. An important puppet organisation is the National Marionette Theatre in Prague. Its repertoire mainly features a marionette production of Mozart's opera "Don Giovanni". The production has period costumes and 18th-century setting. There are numerous other companies, including Buchty a Loutky ("Cakes and Puppets"), founded by Marek Bečka. Puppets have been used extensively in animated films since 1946. Jiří Trnka was an acknowledged leader in this area. Miroslav Trejtnar is a master puppeteer and teacher of traditional Czech marionette-making skills.