Rudolf Frisius was born 1941 in Celle (Germany), and studied mathematics, philosophy and musicology (Hamburg, Frankfurt, Göttingen). He studied contemporary music at the Darmstadt Internationale Ferienkurse für Neue Musik from 1959, with Stockhausen, Ligeti, Koenig, Kagel, Xenakis, Cage and others, and at studios and festivals for electroacoustic music and radiophonic art (München/Siemens, Utrecht, Paris GRM, Bourges, WDR Köln, ZKM Karlsruhe). He is the author of numerous publications and radio programmes (Deutschlandfunk Köln, SWR/SWF Baden-Baden, HR Frankfurt etc) about music theory, musical analysis (e.g. traditional and contemporary harmony, musical form, notation and composition), and contemporary composers. These include writing on Stockhausen (interviews and analysis of works: two volumes, volume 3 in preparation), Ligeti, Xenakis, Henry, Bayle, Ferrari, and Rihm. He lectures in Karlsruhe, Darmstadt, Paris, Aix-en-Provence, Salzburg, Delphie, Kalkutta, Seoul, and Kyoto.