On June 4, 2008, the Austrian Academy of Sciences organized a symposium in memory of the 150th birthday of Carl Auer von Welsbach. Life and work of this famous Austrian scientist and businessman was discussed from many points of view. Participants included experts in physics and chemistry who presented many of the inventions and discoveries of Auer von Welsbach, but also members of his family, the director of the Auer Welsbach Museum, and the current director of the Chemische Werke Althofen which had been founded by Auer von Welsbach. In this way a multi-faceted picture of the achievements of Carl Auer von Welsbach is presented to the reader.