Born 1957 in Krumbach/Schwaben, youth in Ulm until 1978 (Germany). Lives in Munich since 1978. Study: Art History since 1978, doctorate in 1988 (Ludwig-Maximilians-University, Munich). Writes art criticism since 1985, mostly on intermedia art, conceptual art, performance art and computer art, esp. net art. Published books: Conceptual Art in America and England from 1963 to 1976 (in german, Peter Lang, Frankfurt 1992); Performance Art since 1945: Action Theater and Intermedia (in german, Wilhelm Fink, Munich 2001). Website: Intermedia Art: http://dreher.netzliteratur.net (in german). IASLonline Lessons in NetArt (: http://www.iasl.uni-muenchen.de/links/lektion01.html (german/english).