The most known people from Essen are the actor Heinz Rühmann, whose parents were the owner of Essen's famous hotel "Handelshof" near the Central Station ("Hauptbahnhof)", Carl Humann, explorer of the Great Altar of Pergamon, Karl Baedeker, a publisher whose company made many books for tourists ("Baedeker"), Alfred Krupp and Franz Dinndendahl, who made the first steam machine in the Ruhr area. These people were born in the city. Other people who were not born in Essen but lived and worked there a long time are Berthold Beitz, who saved the Krupp company from the ruin, Wilhelm Busch, a famous poet and painter or Gustav Heinemann, a German politician who was mayor of Essen and federal president of Germany. Other people like Otto von Bismarck and Paul von Hindenburg were honorary people in Essen.