Even as a youngster, before his education as a mechanical engineer, he researched the "lost" history of the St. Georgen-Gusen-Mauthausen area with its four Nazi concentration camps and focused as a pioneer on the history of the KZ Gusen I & II & III Concentration Camps.
Rudolf Nureyev | Rudolf Steiner | Rudolf Virchow | Rudolf Hess | Rudolf II, Holy Roman Emperor | Rudolf Kempe | Rudolf Hilferding | Rudolf | Rudolf Schwarz | Rudolf Haag | Rudolf, Crown Prince of Austria | Rudolf Schwarz (conductor) | Rudolf Platte | Rudolf Nebel | Rudolf Carnap | Rudolf Thurneysen | Rudolf Stingel | Rudolf Serkin | Rudolf II | Rudolf Bultmann | Rudolf Baumgartner | Rudolf von Jhering | Rudolf Scharping | Rudolf Otto | Rudolf (musical) | Rudolf Kreitlein | Rudolf III, Duke of Saxe-Wittenberg | Rudolf Hruska | Rudolf Flesch | Rudolf Erich Raspe |